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Chickadee

Chickadees are a group of small, non-migratory songbirds in the genus Poecile within the tit family Paridae, native primarily to North America. These compact birds, typically measuring 4 to 6 inches in length, feature bold black caps and bibs contrasting with white cheeks, grayish backs, and pale underparts, giving them a distinctive and often endearing appearance. Renowned for their acrobatic foraging—frequently hanging upside down to access food—and their complex "chick-a-dee" calls, chickadees are social creatures that form flocks year-round, enhancing survival through cooperative vigilance against predators. Seven species occur in North America, including the ubiquitous Black-capped Chickadee (Poecile atricapillus) and the boreal-dwelling Gray-headed Chickadee (Poecile cinctus), inhabiting diverse environments from coniferous forests to suburban gardens.^[1]^[2]^[3] Highly adaptable, chickadees thrive in wooded habitats across the continent, from Alaska's boreal forests to Mexico's montane woodlands, often expanding into human-altered landscapes where they frequent bird feeders for seeds, suet, and peanuts. Their diet shifts seasonally: insects and berries dominate in breeding season, while cached seeds sustain them through harsh winters, with individuals able to remember thousands of hiding spots due to neuroplasticity in their hippocampus. Social hierarchies govern flock dynamics, and mixed-species foraging groups—pairing with nuthatches, kinglets, and woodpeckers—improve food discovery and mobbing responses to threats like hawks. Vocal repertoire is sophisticated; the variable "chick-a-dee-ee" call conveys information on predator type and urgency, with more "dee" notes indicating greater danger.^[4]^[2]^[5] Breeding occurs in spring, with pairs excavating cavities in soft wood or using nest boxes, laying 6–13 eggs that hatch after about two weeks. Chickadees exhibit remarkable intelligence, including exceptional spatial memory that allows them to remember thousands of food caching locations, rivaling that of larger animals. While most populations are stable and common—thanks to their resilience and lack of significant threats—some species like the Chestnut-backed Chickadee face localized pressures from habitat fragmentation. Their year-round presence and bold curiosity make chickadees beloved subjects of study and popular backyard visitors.^[4]^[6]^[2]

Taxonomy

Etymology

The name "chickadee" is an onomatopoeic term derived from the bird's distinctive alarm call, rendered as "chick-a-dee-dee-dee," which mimics the repetitive, high-pitched notes used to warn of predators.^[7]^[8] This English usage originated in North America during the early 19th century, with the earliest recorded appearance in print dating to 1832.^[9]^[8] Early European settlers in North America adopted "chickadee" as a common name for these birds, distinguishing them from their Eurasian relatives, which were known as "tits" or "titmice" in European ornithology due to similar vocalizations and behaviors but adapted to local contexts.^[10] This nomenclature reflected the settlers' observations of the birds' calls in the New World, avoiding direct equivalents to the Old World terms like "tom-tit," which had been used sporadically but did not persist.^[11] Linguistic variations appear in indigenous North American languages, where names often echo the bird's vocalizations independently of English influence; for instance, the Cherokee term "tsigili'i" (or similar spellings like tsikili) predates European contact and likely contributed to the phonetic basis of "chickadee" through cultural exchange.^[12] Other examples include the Arikara "škipipi," also onomatopoeic.^[13] The scientific binomial nomenclature for the genus Poecile, encompassing several chickadee species, originates from the Ancient Greek "poikilos," meaning "multicolored" or "spotted," reflecting the birds' varied plumage patterns; the genus was formally established by German naturalist Johann Jakob Kaup in 1829.^[14] This contrasts with earlier placements in the broader Parus genus for tits, highlighting evolutionary distinctions in North American taxa.^[15]

Classification

Chickadees are small passerine birds belonging to the family Paridae, which encompasses tits and chickadees, and are classified within the genus Poecile Kaup, 1829. The genus Poecile comprises approximately 15 species distributed across North America, Europe, and Asia, with North American species commonly referred to as chickadees and Eurasian species often called tits. The name Poecile derives from the Ancient Greek poikilos, meaning "multicolored" or "spotted," reflecting the varied plumage patterns in the group.^[16] Phylogenetic analyses reveal two primary clades within Poecile: a North American clade encompassing species such as the black-capped chickadee (P. atricapillus) and mountain chickadee (P. gambeli), and an Eurasian clade including the willow tit (P. montanus) and sombre tit (P. lugubris). These clades reflect biogeographic patterns, with the North American group showing monophyly and serving as the sister group to certain Eurasian taxa. Hybridization occurs in contact zones between closely related species, notably between the black-capped chickadee and Carolina chickadee (P. carolinensis), where a narrow hybrid zone spans from southeastern Kansas to New Jersey, influenced by climatic shifts.^[17] Recent taxonomic revisions have reclassified certain taxa within Poecile, such as the former Siberian tit (Parus cinctus), now recognized as the gray-headed chickadee (P. cinctus), based on molecular evidence supporting its placement in the genus alongside other chickadees and tits.^[18]

Description

Physical features

Chickadees, belonging to the genus Poecile, are small passerine birds characterized by their compact bodies, typically measuring 10–15 cm in length and weighing between 7–14 grams across species.^[19]^[20]^[21] Their build features a large head relative to the body, a short neck, and rounded, short wings that contribute to a spherical appearance, enabling quick maneuvers in dense vegetation.^[19]^[22] This morphology supports their agile flight capabilities, with wingbeats reaching up to 27–30 times per second for rapid, undulating travel at speeds around 12 mph.^[23] A key anatomical adaptation is their stout, short bill, which is finely tapered and suited for cracking seeds and extracting insects from crevices.^[24]^[25] Chickadees also possess strong, short legs and sturdy feet with flexible toes, allowing them to perch securely, hang upside down, and forage acrobatically on branches and foliage.^[26]^[27]^[28] Sexual dimorphism in chickadees is minimal, with males generally slightly larger than females in overall size and subtle plumage brightness, though both sexes share similar body proportions.^[29]^[30] Juveniles are distinguishable from adults by their softer, fluffier plumage and narrower, more pointed wing feathers, which provide a less crisp appearance during their initial post-fledging period.^[31] Plumage colors, such as the characteristic black cap and bib with white cheeks, aid in species identification but vary in detail across the genus.^[19]

Plumage variations

Chickadees in the genus Poecile exhibit distinctive plumage characterized by a bold black cap and bib contrasting against white cheeks and paler body feathers, providing key identification markers. The body is typically grayish or white, with gray wings often edged in white, creating subtle wing bars visible in flight. These patterns serve primarily for species recognition and signaling within flocks.^[19]^[32] Variations occur across species, notably in back and flank coloration; for instance, the Chestnut-backed Chickadee (Poecile rufescens) features a rich reddish-brown back and rump, while the Boreal Chickadee (Poecile hudsonicus) has a brown crown and reddish-brown flanks shading the white underparts. The Black-capped Chickadee (Poecile atricapillus) and Carolina Chickadee (Poecile carolinensis) share a uniform gray back and buffy flanks, though the former shows brighter contrasts post-molt. Such differences aid in distinguishing closely related taxa in overlapping ranges.^[33]^[29] Chickadees undergo a complete annual prebasic molt from July to October, replacing all feathers without a spring molt, which maintains consistent coloration year-round but allows for denser plumage post-molt. After the autumn molt, they grow denser plumage with about 25% more feathers than in summer. In winter, they also fluff their feathers to trap air for insulation, enhancing thermoregulation without altering pigment patterns. This seasonal adjustment subtly affects appearance, making birds appear bulkier.^[34]^[29] Juveniles display duller versions of adult plumage, with less pronounced black caps and bibs, buffier underparts, and more pointed tail feathers, transitioning to adult-like feathers during the first fall molt. Sexes are monomorphic overall, but males often exhibit brighter white cheeks, larger bibs, and higher contrast between black and gray regions, serving as subtle status signals in dominance hierarchies. These markers are most evident in fresh fall plumage.^[19]^[35]^[29]

Distribution and habitat

Geographic range

Chickadees of the genus Poecile are primarily distributed across North America, spanning from Alaska in the north to Mexico in the south, encompassing diverse regions including boreal forests, temperate woodlands, and montane areas.^[36]^[37] This broad continental coverage includes species such as the Black-capped Chickadee (P. atricapillus) across much of the continent and the Mountain Chickadee (P. gambeli) in western mountainous zones extending southward.^[38] Several species extend the genus's range into Eurasia, including the Holarctic Gray-headed Chickadee (P. cinctus), which ranges from northern Europe across Asia to extreme northwestern North America, and others such as the Willow Tit (P. montanus).^[18] Their altitudinal distribution ranges from sea level to subalpine forests, reaching elevations up to 3,700 meters (12,000 feet), particularly during the nesting season for montane species like the Mountain Chickadee.^[39]^[40] This vertical span allows chickadees to occupy varied topographic features within their latitudinal range, from coastal lowlands to high-elevation conifer zones.^[41] Historical range expansions occurred post-glaciation during the late Pleistocene, as retreating ice sheets around 18,000 years ago enabled northward recolonization from southern refugia, shaping current phylogeographic patterns in species like the Carolina Chickadee (P. carolinensis) and Mountain Chickadee.^[42] As of 2025, while populations are generally stable, climate change is driving northward shifts in distribution, particularly in the hybrid zone between Black-capped and Carolina Chickadees. Recent assessments indicate that climate-induced changes in forest composition may be reducing suitable habitat for boreal species like the Gray-headed Chickadee.^[43]^[44] Populations remain fragmented in urban areas where habitat patches support adapted groups as "urban adaptors."^[45]

Habitat types

Chickadees, including species such as the black-capped chickadee (Poecile atricapillus), primarily inhabit deciduous and mixed deciduous-coniferous forests, with a strong preference for woodland edges where open understories facilitate foraging while providing access to denser cover. These birds are also commonly found in open woods, parks, willow thickets, cottonwood groves, and suburban backyards featuring mature trees like oaks, maples, birches, alders, and willows, which support essential insect prey and nesting sites.^[46] They exhibit notable tolerance for human-altered landscapes, thriving in disturbed areas, residential neighborhoods, and urban green spaces as long as sufficient woody vegetation is present. At the microhabitat level, chickadees seek dense vegetative cover for nesting, often utilizing natural cavities in rotten wood, abandoned woodpecker holes, or soft-rotted snags of alder and birch trees, typically at heights of 1.5–7 meters above ground. For foraging, they favor open understories and arboreal structures like tree bark, trunks, and twigs, allowing efficient gleaning of insects and seeds without excessive obstruction.^[47] This combination of sheltered nesting zones and accessible foraging areas is critical for their survival across varied woodland fragments, including those with large canopies of mature trees.^[48] Seasonally, chickadees show adaptability, relying more heavily on evergreen stands—such as coniferous forests with spruce, fir, or pine—for winter shelter and roosting in dense foliage to conserve heat during cold nights.^[49] In milder conditions, mixed deciduous-evergreen habitats remain suitable year-round, supporting their flocks in orchards, woodlots, and suburban settings.^[36] These preferences enable chickadees to exploit a range of ecosystems while maintaining proximity to reliable food sources and protection from predators.^[32]

Behavior

Diet and foraging

Chickadees are omnivorous birds with a diet that varies seasonally to meet their high energy demands. In summer and breeding seasons, they primarily consume insects such as caterpillars, aphids, beetles, and spiders, which form the bulk of their intake to support rapid growth in nestlings.^[50]^[51] During winter, their diet shifts to include a greater proportion of plant-based foods, including seeds, berries, and occasionally suet or other fats, comprising roughly half animal and half plant matter to sustain survival in harsh conditions.^[52]^[2] Foraging occurs exclusively during daylight hours, with chickadees employing agile techniques to access food in their woodland habitats. They frequently hang upside down from branches or twigs to reach insects or seeds, and glean prey from bark, leaves, and foliage surfaces.^[2] They rarely forage on the ground, preferring to search tree bark and crevices, and often transport larger items to safer spots for consumption.^[52] To prepare for winter scarcity, chickadees cache food extensively by wedging seeds, insects, or berries into bark crevices, sometimes storing thousands of items per season.^[53] This behavior, linked to their spatial memory capabilities, helps buffer against food shortages.^[2] Chickadees have a high metabolic rate, particularly in cold climates, consuming nearly 60% of their body weight in food daily to maintain energy levels and gain fat reserves.^[54] This adaptation allows them to endure low temperatures by building up to 8% additional body fat each day.^[50]

Vocalizations

Chickadees are renowned for their complex vocal repertoire, with the "chick-a-dee" alarm call serving as a primary means of alerting conspecifics to potential threats. This call typically consists of an introductory "chick-a" followed by a variable number of "dee" notes, where the quantity of "dee" notes encodes information about the predator's size and threat level; for instance, smaller, more agile predators like hawks elicit calls with more "dee" notes (often 3–4 or more), signaling higher danger and prompting intensified mobbing behavior, whereas larger, less mobile predators like great horned owls produce fewer "dee" notes (typically 1–2).^[55] These mobbing calls facilitate coordinated group responses, rallying nearby birds to harass the intruder.^[55] In addition to alarm calls, male chickadees produce a simple whistled song known as the "fee-bee," consisting of two notes—a higher-pitched "fee" followed by a lower "bee"—primarily to defend territories and attract mates during the breeding season.^[56] This song exhibits geographic dialects, with variations in pitch, syllable structure, and repertoire observed across populations; for example, birds on Massachusetts offshore islands often sing monotonal versions or maintain larger song repertoires (up to 8 types), while mainland populations favor a consistent two-note pitch-shifting pattern, and Oregon birds display diverse dialects with multiple song types.^[57] These dialects arise from local learning and cultural transmission, contributing to pair bonding by allowing recognition of familiar regional variants.^[57] Acoustically, chickadee vocalizations, including both alarm calls and songs, primarily occupy a frequency range of 4–8 kHz, enabling clear transmission through forested habitats while minimizing overlap with lower-frequency sounds from larger animals.^[58] The "fee-bee" song features the first note at approximately 3.5–4.1 kHz and the second at 3.1–3.6 kHz, with durations of 0.3–0.4 seconds per note, whereas the "dee" notes in alarm calls often include harmonics extending into higher frequencies for emphasis during mobbing.^[56] This spectral profile supports effective communication in social contexts, such as mobbing predators and reinforcing pair bonds.^[56]

Cognition and memory

Chickadees, particularly species like the black-capped (Poecile atricapillus) and mountain chickadee (Poecile gambeli), possess remarkable spatial memory that enables them to cache thousands of food items and retrieve them accurately over extended periods. This ability is crucial for survival in harsh winters, where they rely on stored seeds and insects hidden in bark crevices or other sites. Experimental studies demonstrate that control birds achieve high retrieval accuracy, significantly exceeding chance levels (typically 6-9%), even after delays of several hours, with performance remaining consistent across multiple trials. In natural settings, chickadees can remember cache locations for weeks to months, supporting their foraging strategy of scatter-hoarding single items to minimize pilferage risks.^[59]^[60] This exceptional memory is underpinned by neuroplasticity in the hippocampus, a brain region essential for spatial processing. In black-capped chickadees, hippocampal volume enlarges by up to 20% in the fall, coinciding with peak caching activity, and remains elevated through winter to facilitate cache retrieval. Lesions to the hippocampus reduce recovery accuracy to near-chance levels, confirming its critical role, while the seasonal expansion correlates directly with caching demands and involves increased neurogenesis. These changes reverse in spring, when caching decreases, highlighting adaptive brain plasticity unique to food-storing birds.^[59]^[61] Beyond spatial memory, chickadees display broader cognitive prowess, including problem-solving and predator recognition. In laboratory experiments, they successfully solve puzzles to access food, with pure-species individuals succeeding in approximately 95% of trials, outperforming hybrids that struggle with associative learning tasks. Observations also indicate rudimentary tool use, such as a mountain chickadee employing a twig to probe for insects in tree bark during foraging. Additionally, chickadees encode specific predator information in their mobbing calls, varying note composition to signal threat level and raptor size, which conspecifics and heterospecifics like nuthatches recognize and respond to appropriately during mobbing behaviors.^[62]^[63]^[64]

Reproduction

Breeding biology

Chickadees exhibit social monogamy, with pairs typically forming in late winter or early spring as day length increases.^[65] In species such as the black-capped chickadee (Poecile atricapillus), pair bonds often develop within winter flocks, where dominant individuals secure mates through dominance interactions and vocal signaling.^[4] Courtship behaviors include the male's production of the characteristic "fee-bee" song, which begins in late winter and serves to attract and stimulate the female, along with food-passing displays where the male feeds the female to strengthen the bond.^[32] Breeding occurs annually in most chickadee species, though southern populations like the Carolina chickadee (Poecile carolinensis) may raise one or occasionally two broods per season.^[66] In North America, egg-laying generally takes place from April to June, with clutch sizes ranging from 6 to 13 eggs, averaging 6 to 8 in black-capped chickadees.^[4]^[67] The female alone incubates the eggs for 12 to 13 days, during which the male provides food to her at the nest site.^[68] These reproductive patterns are triggered by photoperiod, where increasing day length surpasses a critical threshold, stimulating gonadotropic hormones such as luteinizing hormone and follicle-stimulating hormone to initiate gonadal development and breeding readiness.^[69]

Nesting and parental care

Chickadees typically nest in cavities, either excavated by the pair in soft, decaying wood such as dead snags or rotten branches, or in existing holes like old woodpecker nests or artificial birdhouses.^[4] These sites are often placed 1.5 to 7 meters above ground, though heights up to 20 meters occur.^[4] The female constructs the nest, starting with a foundation of moss and other coarse plant materials to fill and conceal the chamber, then lining the cup with softer substances like animal fur, hair, feathers, and plant down for insulation and comfort.^[4]^[70] During the 12–13 day incubation period, the female alone incubates the clutch of 6–8 eggs (up to 13), while the male provides food to her at or near the nest entrance.^[4]^[32] Upon hatching, the altricial young are brooded primarily by the female for the first week, with the male delivering most food initially; both parents then share nestling care, feeding insects, seeds, and berries to the brood.^[4]^[32] Nestlings fledge after 16–21 days, depending on the species, remaining dependent on parents for food and protection for up to three weeks post-fledging.^[32]^[71] Brood parasitism is rare in chickadees, owing to their cavity-nesting habits that deter interlopers like brown-headed cowbirds, though occasional intraspecific parasitism has been documented. Overall nesting success rates range from 50–70%, with higher survival in mature forests providing ample cavity sites and cover from predators.^[72]^[73] Most pairs raise one brood per season, but a second brood is possible in favorable conditions, particularly if the first succeeds early.^[4]^[74]

Species

North American species

The North American chickadees belong to the genus Poecile within the family Paridae, comprising seven species adapted to diverse habitats across the continent. These small, acrobatic songbirds are characterized by their distinctive "chick-a-dee" calls, bold black-and-white head patterns, and year-round residency in most ranges, though some exhibit limited movements. The species include the widespread Black-capped Chickadee and its southeastern counterpart, the Carolina Chickadee, alongside more regionally restricted taxa like the Boreal, Chestnut-backed, Mountain, Mexican, and Gray-headed Chickadees.^[75]^[1] The Black-capped Chickadee (Poecile atricapillus) is one of the most familiar and widespread, occupying deciduous and mixed woodlands, suburbs, and parks across Alaska, Canada, and the northern and western United States, from the Pacific coast to the Atlantic. It features a crisp black cap and bib contrasting sharply with white cheeks, a soft gray back and wings, and buffy flanks on otherwise whitish underparts; adults measure about 12-15 cm in length. This species is known for its adaptability, often visiting feeders and forming mixed flocks with other birds during winter. Where its range overlaps with the Carolina Chickadee in a narrow hybrid zone stretching from New Jersey to Kansas, interbreeding occurs, producing hybrids with intermediate traits that complicate identification.^[2]^[76] In contrast, the Carolina Chickadee (Poecile carolinensis) inhabits similar wooded and suburban environments but is restricted to the southeastern United States, from Texas to Florida and northward to the Mid-Atlantic states. It shares the black cap and bib but has a slightly browner cap, grayer nape, less contrast on the wings, and paler underparts compared to the Black-capped; it is marginally smaller at 10-12 cm. Vocalizations provide key identification aids: its whistled song consists of 4-5 notes delivered more rapidly (about 6-7 per second in the "dee" call notes), while the Black-capped's is slower (around 4 per second) with a lower pitch. Hybridization in the overlap zone, influenced by climate-driven range shifts, results in birds with mixed plumage and songs, often rendering field identification unreliable without genetic analysis.^[77]^[76]^[78] The Boreal Chickadee (Poecile hudsonicus) is a northern specialist, residing year-round in coniferous taiga forests across Alaska, Canada, and the northernmost U.S. states like Minnesota and Maine. Unlike its southern relatives, it has a dull brown cap and back, with a smaller black bib and grayish underparts, measuring 13-15 cm; its subdued plumage aids camouflage in snowy boreal environments. It rarely ventures south except during occasional irruptive winters, and identification is straightforward due to its limited range overlap with other chickadees.^[3]^[75] Along the Pacific coast, the Chestnut-backed Chickadee (Poecile rufescens) thrives in moist coniferous forests from Alaska to northern California, with some inland populations in the Sierra Nevada and Cascades. This 11-14 cm bird stands out with its rich chestnut-brown back and flanks, black cap and bib, and white cheeks, transitioning to grayer upperparts in southern populations. It is non-migratory but may shift elevations seasonally, and while it coexists with Black-capped Chickadees in the north, vocal and plumage differences—such as its higher-pitched calls—facilitate distinction.^[6]^[75] The Mountain Chickadee (Poecile gambeli) occupies higher-elevation coniferous forests in the Rocky Mountains and Sierra Nevada, from British Columbia to Mexico, typically between 1,500 and 3,000 meters. At 12-14 cm, it resembles the Black-capped but is distinguished by a prominent white eyebrow stripe over the eye, a black cap and bib, and gray upperparts with less buff on the sides. In areas of overlap with Black-capped Chickadees in the northern Rockies, it adjusts its song dialect to avoid interference, and its hoarser calls aid separation.^[38]^[75] The Mexican Chickadee (Poecile sclateri) is the southernmost chickadee in North America, primarily inhabiting pine-oak woodlands and montane forests in Mexico, with a limited range extending into the southwestern United States, specifically the Chiricahua Mountains of southeastern Arizona and the Animas Mountains of southwestern New Mexico, at elevations of 1,900–3,000 meters. Measuring 12–13 cm in length, it features a black cap and bib, white cheeks, and brownish-gray upperparts with whitish underparts and rusty flanks; its plumage is similar to the Mountain Chickadee but distinguished by a less prominent eyebrow and different vocalizations, including a whistled song. It is non-migratory and occurs in isolation from other chickadees in most of its range, making identification straightforward where present.^[79]^[80] The Gray-headed Chickadee (Poecile cinctus), also known as the Siberian Tit, has a limited North American distribution in western Alaska and adjacent Yukon Territory, breeding in coniferous boreal forests near the Bering Strait. In North America, this 11–13 cm species displays pale gray plumage with a brown crown, white cheeks, a black bib, and buffy flanks for camouflage in snowy habitats; it is non-migratory and adapted to extreme cold. Its presence in North America represents a relict population from historical Beringian connections, with minimal overlap with other chickadees; full details on its morphology, behavior, and broader Holarctic range are covered in the Eurasian species subsection below.^[81]^[18] Distributional overlaps, particularly between Black-capped and Carolina Chickadees in the eastern U.S., pose the greatest identification challenges due to hybridization rates as high as 60% in some zones, leading to variable plumage (e.g., intermediate neck side colors) and songs. Western overlaps, such as between Black-capped and Mountain or Chestnut-backed, are less problematic, relying on subtle features like eyebrow stripes or back coloration. Observers in hybrid zones are advised to use multiple cues, including calls and genetics, for accurate identification. Overlaps with the Mexican Chickadee are absent, while the Gray-headed's North American range is too remote for significant interactions with other species.^[76]^[78]^[75]

Eurasian species

The Eurasian species within the genus Poecile are primarily known as tits rather than chickadees, reflecting regional nomenclature differences for these small, acrobatic songbirds in the family Paridae. These birds occupy diverse woodland habitats across Europe and Asia, sharing morphological and behavioral traits such as compact bodies, strong legs for foraging, and complex vocal repertoires with their North American relatives, though detailed classification is covered elsewhere. Unlike the more southerly distributed North American forms, Eurasian Poecile species are strongly associated with northern temperate and subarctic environments, with limited faunal exchange historically facilitated by the Bering land bridge during Pleistocene glaciations. In addition to the species detailed below, several others occur in central and eastern Asia, including the Sombre Tit (Poecile lugubris), Père David's Tit (Poecile davidi), and others.^[18]^[81] The Gray-headed Chickadee (Poecile cinctus), also called the Siberian Tit, is the most northerly and widespread Eurasian representative, breeding across subarctic Scandinavia, Siberia, and the Russian Far East, with its range extending eastward into western Alaska via the Beringia region. This Holarctic species features pale gray plumage overall, with a darker brown crown, white cheeks, a prominent black bib, and buffy flanks, providing camouflage in snowy boreal landscapes. Adults measure about 11–13 cm in length, with fluffy feathers that enhance insulation against extreme cold, down to –60°C in taiga winters.^[18]^[81]^[82] The Willow Tit (Poecile montanus) inhabits damp, regenerating woodlands and coniferous forests throughout temperate and boreal Europe and Asia, from the British Isles to Japan, favoring areas with dense understory and standing dead wood for nesting. It has a sooty-brown crown, pale buff underparts, and a black bib similar to other Poecile, but is distinguished by its softer, nasal calls and a body size of 11–12.5 cm. This species excavates nest cavities in rotting wood, adapting to wet taiga edges where it forages for insects and seeds year-round.^[83]^[84] The Marsh Tit (Poecile palustris) occurs in mature deciduous and mixed woodlands across central and western Europe to eastern Siberia, preferring oak-beech stands with open undergrowth and proximity to water, though not exclusively marshy habitats. Measuring 11–12 cm, it displays a glossy black cap, white cheeks, and pale underparts with a less extensive bib than congeners, often identified by its sharp "pitchoo" call. It thrives in lowland to montane forests of the taiga zone, caching food in bark crevices to survive harsh winters.^[85] These Eurasian Poecile species exhibit key adaptations to boreal and taiga ecosystems, including extensive food hoarding in fall to buffer against long, food-scarce winters and physiological tolerance for subzero temperatures through torpor and feather ruffling. Their distributions reflect post-glacial recolonization patterns, with the Gray-headed Chickadee's Alaskan presence as a remnant of ancient Beringian connectivity, while Willow and Marsh Tits show greater endemism to Palearctic lowlands. Population densities remain stable in intact forests but are sensitive to habitat fragmentation in these vast coniferous belts.^[81]^[83]^[18]

Conservation

Population status

The majority of chickadee species (genus Poecile) are classified as Least Concern on the IUCN Red List, indicating no immediate risk of extinction at the global scale.^[86] For instance, the Black-capped Chickadee (P. atricapillus), one of the most widespread North American species, has an estimated 43 million mature individuals (2011 estimate) and a decreasing population trend (Partners in Flight 2024).^[86] Similarly, the Boreal Chickadee (P. hudsonicus) and Eurasian Chickadee (P. montanus) are also rated Least Concern, with populations showing resilience across their boreal and temperate forest ranges. The 2025 U.S. State of the Birds report highlights ongoing declines across North American biomes, affecting species like chickadees despite their overall Least Concern status.^[87] Despite overall stability, some regional populations in eastern North America have experienced declines. The Carolina Chickadee (P. carolinensis), concentrated in the southeastern United States, has decreased by approximately 16% between 1966 and 2019.^[88] Recent eBird data indicate that Black-capped Chickadee numbers in parts of the eastern U.S. have declined by up to 20% over the past decade.^[89] However, recent continental trends indicate an overall decrease for the Black-capped Chickadee (Partners in Flight 2024), aligning with regional declines in the eastern U.S.^[90] Population monitoring for chickadees relies heavily on citizen science efforts like the Audubon Christmas Bird Count, which tracks winter abundances across thousands of sites annually. This long-term dataset, spanning over a century, reveals variability in local counts but confirms general stability for most species.^[91] Additionally, chickadees demonstrate positive adaptation to urban and suburban environments, where supplemental feeders and green spaces have contributed to localized population boosts.^[32]

Threats and protection

Chickadees face several primary threats that impact their populations across North America. Habitat loss due to deforestation and urban development reduces available nesting sites and foraging areas, particularly for cavity-nesting species like the black-capped chickadee, which relies on dead trees and forest edges.^[92] Logging and fragmentation in mountainous regions similarly threaten species such as the mountain chickadee by altering coniferous forest habitats essential for their survival.^[93] Climate change exacerbates these pressures by shifting suitable habitats northward, forcing range adjustments in chickadee species. For instance, the hybrid zone between black-capped and Carolina chickadees has moved northward by approximately 200 kilometers since the 1960s, driven by warming temperatures that favor southern species in overlapping areas.^[94] Models predict that by 2050, suitable habitat for Carolina chickadees in eastern North America could shift drastically northward, potentially reducing boreal forest availability for black-capped chickadees by over half under moderate warming scenarios.^[95]^[96] Similarly, the gray-headed chickadee's southern range limit has already retracted northward, with projections indicating continued contraction due to altered winter conditions; in Canada, the Gray-headed Chickadee was assessed by COSEWIC in 2024 as potentially Threatened due to climate-driven range contractions, with ongoing consultations for listing under the Species at Risk Act as of 2025.^[44] Predation poses another significant risk, with domestic cats and raptors like sharp-shinned hawks targeting chickadees at feeders and in woodlands. Free-roaming cats are the leading direct human-caused threat to North American birds, killing an estimated 2.4 billion annually, including small songbirds such as chickadees that frequent suburban areas. Hawks, being agile predators, elicit strong anti-predator responses from chickadees, including mobbing calls, but increased hawk populations near urban edges heighten vulnerability for foraging flocks.^[97]^[98] Conservation efforts focus on mitigating these threats through legal protections and targeted programs. All chickadee species in the United States, including black-capped, Carolina, and mountain chickadees, are protected under the Migratory Bird Treaty Act of 1918, which prohibits their taking, possession, or sale without permits, helping to curb habitat destruction and direct harm.^[99] Designations as state birds further raise public awareness and support conservation; the black-capped chickadee holds this honor in four U.S. states—Maine, Massachusetts, New Hampshire, and New York—promoting habitat preservation initiatives.^[100]^[101] Practical measures include nest box programs that provide artificial cavities to offset habitat loss from tree removal. Organizations like the National Audubon Society offer plans for chickadee-specific birdhouses, placed in wooded areas to support breeding and roosting, with successful programs increasing local populations of black-capped and Carolina chickadees by supplementing natural sites.^[102]^[103] During disease outbreaks, such as the 2022 highly pathogenic avian influenza (H5N1) surge that spread through wild bird populations and caused widespread mortality, authorities recommended temporary bans on bird feeders to prevent congregation and transmission among songbirds like chickadees.^[104]^[105] Although songbirds faced lower mortality than waterfowl, these measures helped limit localized impacts on feeder-dependent flocks.^[106]

References

[1]
Paridae Browse by Family, All About Birds, Cornell Lab of Ornithology
Paridae includes Tits, Chickadees, and Titmice, such as the Carolina Chickadee, Black-capped Chickadee, and Great Tit.
[2]
Black-capped Chickadee - All About Birds
A bird almost universally considered “cute” thanks to its oversized round head, tiny body, and curiosity about everything, including humans.Sounds · Adult · Life History · ID info
[3]
Boreal Chickadee Overview, All About Birds, Cornell Lab of ...
A chickadee with a brown instead of a black cap, the Boreal Chickadee lives in coniferous forests of the far north year-round.Basic Description · Find This Bird · Backyard Tips
[4]
Black-Capped Chickadee Life History - All About Birds
Chickadees are active, acrobatic, curious, social birds that live in flocks, often associating with woodpeckers, nuthatches, warblers, vireos, and other small ...
[5]
How Chickadees Use Their Brains to Hide Seeds and Survive Harsh ...
Jan 11, 2022 · Every fall, chickadees hide tens of thousands of food items, counting on these "cached" seeds and even insects to see them through harsh ...
[6]
Chestnut-backed Chickadee Overview, All About Birds, Cornell Lab ...
Basic Description Active, sociable, and noisy as any chickadee, you'll find these birds at the heart of foraging flocks moving through tall conifers with ...
[7]
Chickadee - Etymology, Origin & Meaning
Originating in 1834 American English, this word is echoic of the black-capped titmouse's call, meaning it mimics the bird's distinctive dee-dee-dee cry.
[8]
CHICKADEE Definition & Meaning - Merriam-Webster
Word History. Etymology. imitative. First Known Use. 1832, in the meaning defined above. Time Traveler. The first known use of chickadee was in 1832. See more ...
[9]
chickadee, n. meanings, etymology and more
Originally North American. 1. ... Any of several North American titmice of the genus Poecilus; esp. (more fully black-capped chickadee) P. atricapillus of forests ...
[10]
Birdist Rule #71: Figure Out What Kind Of Chickadees You've Got
May 25, 2016 · And just so we're clear, the reason they're chickadees here and tits everywhere else isn't because our Puritan settlers couldn't say such a ...
[11]
Are chickadees and "tits" of the same species? | San Diego Reader
Jun 10, 1999 · Early colonists in the know may have called the chickadee a tom-tit, its English common name, but the first Americans had more on their ...
[12]
Native American Chickadee Mythology
The chickadee may be one of several animals with names borrowed from Native American languages. The Cherokee Indian name for this bird, "tsigili'i" (also ...
[13]
Indigenous Bird Names - avianecologist.com - WordPress.com
Aug 13, 2018 · Indigenous Bird Names ; Chickadee – onomatopoeia. Cherokee “Tsigili'i”; Arikara “škipipi” ; American robin – names related to the call. Cree “ ...
[14]
Poecile - Wikipedia
The name Poecile is from Ancient Greek poikilos "colourful". A related word poikilidos denoted an unidentified small bird. It has traditionally been treated as ...
[15]
How birds, like the black-capped chickadee, are named - Star Tribune
Sep 19, 2024 · ... Poecile comes from a Greek word meaning 'many colored.' With a slight suffix change it also meant 'a small bird.' The species epithet ...
[16]
Black-capped Chickadee: Poecile atricapillus | Name This Bird
Oct 14, 2015 · The genus name Poecile from the Latin word poecile meaning “colonnade or gallery.” Bear with me. The Greek word ποικίλη (“poikile”) means ...Missing: origin | Show results with:origin
[17]
Poecile - Wiktionary, the free dictionary
Etymology. From Ancient Greek ποικῐ́λη (poikĭ́lē), feminine form of ποικίλος (poikílos, “spotted, embroidered”). Proper noun. Poecile m. A taxonomic genus ...Translingual · Proper noun · References · Latin
[18]
Paridae (chickadees and titmice) - Animal Diversity Web
The family includes 59 species, divided into nine genera. All of the birds within this family are very vocal. Many of the species within this group have an open ...
[19]
Limited movement of an avian hybrid zone in relation to regional ...
Although the black‐capped/Carolina chickadee hybrid zone ranges from southeastern Kansas to New Jersey (AOU, 1998, https://ebird.org/species/bkcchi/, https:// ...
[20]
Gray-headed Chickadee - Poecile cinctus - Birds of the World
The Gray-headed Chickadee, formerly Siberian Tit, is found from Norway to Alaska, resembles the Boreal Chickadee, and is vulnerable to human disturbance.Missing: etymology | Show results with:etymology
[21]
Black-Capped Chickadee Identification - All About Birds
A bird almost universally considered “cute” thanks to its oversized round head, tiny body, and curiosity about everything, including humans. The chickadee's ...
[22]
Mountain Chickadee Identification - All About Birds
Mountain Chickadees of the Rocky Mountains tend to have short, blunt bills and buffy flanks. In the Great Basin the bill is longer, thinner, and more pointed.
[23]
Chickadee Bird Facts - A-Z Animals
Aug 26, 2025 · In addition to the seven species, the genus Poecile contains eight tits, totaling 15 species. Chickadees belong to the genus Poecile of the ...Missing: taxonomy | Show results with:taxonomy
[24]
Chickadees (Genus: Poecile) - Pacific Wildlife Institute
Chickadees are small, plump birds with a large head, short neck, and a tiny, sharp bill. They have a distinctive black cap and bib, with white cheeks, which are ...Missing: weight dimorphism
[25]
Beating its wings at an incredible 30 times per second, the black ...
Dec 31, 2024 · Beating its wings at an incredible 30 times per second, the black-capped chickadee showcases its agility and trust as it lands on a waiting ...
[26]
Black-capped Chickadee – My Store - Bird Watching Academy
They have large heads and short necks, long tails and a short stout bill. Their chickadee-dee-dee, the call is extremely communicative, used to communicate ...
[27]
Beak - an overview | ScienceDirect Topics
For example, finches have a stout conical bill for cracking seeds. In some species ridges on the hard palate serve to wedge the seed in place in order to crack ...<|control11|><|separator|>
[28]
Chickadees - Cape May Magazine
They also hunt insects and spiders. Their legs are short and sturdy; feet are particularly strong, and this allows such agility.
[29]
Chickadees utilize various tactics to survive - Naturally North Idaho
Jan 10, 2014 · The strong legs of a chickadee allow it to hang upside down while foraging, such as when feeding on the buds at the ends of branches. This ...
[30]
Wonders of Wildlife: Carolina Chickadee
Birds have lightweight beaks instead of heavy jaws and teeth like humans. Most bones in their bodies are hollow or honeycombed, making them very lightweight.Missing: anatomy | Show results with:anatomy
[31]
Plumages, Molts, and Structure - Black-capped Chickadee
Vary with subspecies, age, and sex; males generally slightly larger than females, older birds slightly larger than younger ones (Desrochers 1990 ...
[32]
Parus carolinensis (Carolina chickadee) - Animal Diversity Web
Sexual Dimorphism; sexes alike; male larger. Range mass: 9 to 12 g: 0.32 to 0.42 oz. Average length: 12 cm: 4.72 in. Reproduction. Carolina chickadees begin to ...
[33]
Black-capped Chickadee (Poecile atricapilla) - VARC Molt Portal
Juvenal plumage essentially the same as adults in overall pattern, but somewhat looser in texture. Similar to adults, but cap duller and feathers softer and ...Poecile Atricapilla · Ageing And Sexing (band Size... · Hy/sy
[34]
Black-capped Chickadee | Audubon Field Guide
Length: 5–6 in (12–15 cm); wingspan: 6–8 in (15–20 cm); weight: 0.3–0.5 oz (9–14 g). ... Size. About the size of a Sparrow. Color. Black, Gray ...Missing: physical anatomy
[35]
Recognizing The Seven Chickadee Species of North America
### Plumage Descriptions and Variations for Seven North American Chickadee Species (Genus Poecile)
[36]
Black-capped chickadee - Wikipedia
The bird is well known for its vocalizations, including its fee-bee song and its chick-a-dee-dee-dee call, from which it derives its name. Black-capped ...Taxonomy · Description · Distribution and habitat · Behaviour and ecology
[37]
Winter for Black-capped Chickadees - Go Finger Lakes
Therefore, its greatest defense against cold is its feathers, which increase in number by twenty-five percent after the autumn molt and are remarkably dense for ...
[38]
Black-Capped Chickadee vs Boreal Chickadee - Birdbuddy WIKI
Juvenile black-capped chickadees resemble adults but with duller plumage. The black cap and bib are less pronounced, and their flanks may appear a lighter shade ...Visual Differences · Key Differences And Behavior · Still Not Sure? Here Are...
[39]
Poecile atricapillus - Forest Service - USDA
The black-capped chickadee is resident from western and central Alaska, most of Canada south of the arctic circle, south to extreme northwestern California.Missing: expansion | Show results with:expansion
[40]
The Mountain Chickadees (Poecile gambeli) - Earth Life
Jul 11, 2023 · They tend to breed at elevations of 1.3 miles or 3 km above sea level and move to lower elevations for the winter. Other than those local ...<|control11|><|separator|>
[41]
Mountain Chickadee Overview, All About Birds, Cornell Lab of ...
The tiny Mountain Chickadee is a busy presence overhead in the dry evergreen forests of the mountainous West. Often the nucleus in mixed flocks of small birds.
[42]
Parus gambeli (mountain chickadee) - Animal Diversity Web
Habitat. Poecile gambeli is found in mountain coniferous and mixed woodlands. During nesting season they live at elevations of three kilometers or more. In ...Scientific Classification · Reproduction · Behavior
[43]
Mountain Chickadee - National Park Service
May 4, 2018 · Bottom: Black-capped Chickadees do not have a white band above the eyes. NPS. Poecile gambeli. Length: 4.3-5.5 in (11-14 cm) - Weight: 0.4 oz ( ...
[44]
Distribution - Carolina Chickadee - Poecile carolinensis
Geographic range has experienced both contractions and expansions at range borders with Black-capped Chickadee and at southern range limit (P. Hess unpubl ...Missing: altitude | Show results with:altitude
[45]
[PDF] City life and chickadees: effects of urbanization on vocal output and ...
Our results indicate no detriment to nesting in urban habitats, and suggest that mountain chickadees fall into the intermediate “urban adaptor” species ...
[46]
Black-Capped Chickadee | National Wildlife Federation
Black-capped chickadees are found in deciduous and mixed deciduous-evergreen forests, especially near forest edges. They are commonly found near willows and ...Missing: preferences | Show results with:preferences
[47]
Diet and Foraging - Black-capped Chickadee - Poecile atricapillus
Dec 11, 2020 · Microhabitat For Foraging. Winter: primarily arboreal, especially tree bark, from the main trunk to the thinnest twigs (including the ...
[48]
Habitat - Black-capped Chickadee - Poecile atricapillus
They show a preference for woodlot fragments that feature a large canopy of old trees (Grubb and Bronson 2001).
[49]
Weathering Winter with Chickadees - Nature Alberta
Jan 28, 2022 · If the temperature is fairly mild, a flock will roost together in the dense foliage of evergreens. On colder nights, each chickadee sleeps ...
[50]
Black-capped Chickadee Species Profile, Alaska Department of Fish ...
A chickadee can put on eight percent of their body weight in fat each day. Chickadees are also able to drop their body temperature at night in order to ...Missing: intake | Show results with:intake
[51]
Carolina chickadee | U.S. Fish & Wildlife Service
Nov 8, 2022 · During the warmer months they eat caterpillars, aphids, beetles, spiders and insects. During colder months they eat a variety of seeds, berries ...
[52]
The General Biology of the Black Capped Chickadee- Poecile ...
May 4, 2015 · During this time, they will rarely forage on the ground. In the winter, the Chickadee's diet shifts to half plant based and half animal.
[53]
Flexible use of memory by food-caching birds - PMC - PubMed Central
Black-capped chickadees, for example, are memory specialists. They stash thousands of food items and use their memories to recover these hidden food stores.
[54]
[PDF] Black-Capped Chickadee | Montana FWP
For black-caps, that can mean con- suming nearly 60 percent of their own body weight each day in cold weather. To survive, chickadees store seeds through summer ...
[55]
Allometry of Alarm Calls: Black-Capped Chickadees Encode Information About Predator Size
### Summary of Chickadee Alarm Calls from https://www.science.org/doi/10.1126/science.1108841
[56]
[PDF] Vocal Repertoire of the Black-capped Chickadee
Sep 4, 2024 · lc), but Broken Dees cover a wider frequency range (3.5-7.5 kHz) and the harmonics are more irregular, ascending and descending in pitch ...
[57]
[PDF] Geographic Variation in Black-capped Chickadee Songs and ...
first, third, and fourth whistles (Table 1). Oregon males also showed song dialects and repertoires of at least two different song types. The dawn ...
[58]
Sounds and Vocal Behavior - Carolina Chickadee - Birds of the World
Chevron-shaped notes with dominant frequencies in range of 4–8 kHz. Usually repeated in a series of 2–5 notes. Notes in Loud Tee are well spaced, giving ...
[59]
[PDF] Hippocampus and Memory for Food Caches in Black-Capped ...
Bilateral hippocampal aspiration reduced the accuracy of cache recovery by chickadees to the chance rate, but it did not reduce the amount of caching or the ...
[60]
Flexible use of memory by food-caching birds - eLife
Apr 25, 2022 · We found that chickadees use some navigational strategies that are independent of cache memories, including opportunistic foraging and spatial biases.Missing: accuracy | Show results with:accuracy
[61]
Seasonal hippocampal plasticity in food-storing birds - PMC
Black-capped chickadees (Poecile atricapillus) in Ithaca, NY showed a peak in relative hippocampal size in October, at the same time of year that food storing ...
[62]
Hybrid Chickadees Are Terrible at Memory Games | Audubon
Apr 3, 2018 · Only 62.5 percent of hybrid chickadees were able to solve a puzzle to uncover their food, as opposed to 95 percent of normal chickadees.
[63]
[PDF] Tool Use by a Mountain Chickadee - Digital Commons @ USF
A Mountain Chickadee Parus gambe/i in a flock of eight was observed using a very unusual foraging method that I have interpreted as tool use. The incident.Missing: experiments | Show results with:experiments
[64]
Nuthatches eavesdrop on variations in heterospecific chickadee ...
Mar 27, 2007 · When chickadees discover a perched raptor or terrestrial predator, they produce a “chick-a-dee” alarm call. Unlike the high-frequency “seet” ...
[65]
Breeding - Black-capped Chickadee - Poecile atricapillus
When old cavities are reused, clutch size is larger and laying date is earlier (Wiebe et al. ... Incubation period usually 12–13 d. Female covers eggs with ...Breeding · Nest Site · Parental Care
[66]
CAROLINA CHICKADEE - The Texas Breeding Bird Atlas
Incubation by the female lasts 12-15 days and young birds leave the nest 16-19 days after hatching. One or occasionally two broods may be raised per season in ...
[67]
Black-capped chickadees, from egg to airborne - Arnold Arboretum
Jun 8, 2020 · To facilitate incubation, the female loses a patch of feathers on her breast, called a brood patch. When she sits on the nest, her feathers part ...Missing: softer plumage
[68]
Parus atricapillus (black-capped chickadee) - Animal Diversity Web
They are a small bird weighing only 11 g and measuring 13.3 cm in length. Their wingspans measure 20.3 cm in flight. Their backs and wings are dark greenish- ...
[69]
Photoperiodism and the annual cycle of black-capped chickadees
Once length of day exceeds a critical threshold, birds become photostimulated: gonadotropic hormones (luteinizing hormone and follicle stimulating hormone) are ...Missing: triggers | Show results with:triggers
[70]
Black-capped Chickadee: Nest and Eggs - Avian Report
Chickadees fill up the nesting chamber with nesting material, making the ... The cup's interior is lined with hair, mammal fur, and feathers. The nest ...<|control11|><|separator|>
[71]
Carolina Chickadee | Audubon Field Guide
In fresh plumage (late fall and winter), Black-capped shows more obvious white edgings on feathers of forward part of wing, while Carolina is plain gray there, ...
[72]
[PDF] NestWatch Digest: 2018 Nesting Season
Black-capped. Chickadee nesting success was 16% above the historic av- erage for this region, with 80% of nests successfully fledg- ing at least one young.
[73]
[PDF] the effects of habitat disturbance on the - UNBC
Nest success was lower in the disturbed habitat than in the undisturbed habitat. ... The black-capped chickadee (Poecile atricapilla) is a small (~ 11 g) ...
[74]
Chickadees nesting again | BirdForum
Jun 22, 2008 · Only around 5% of BC Chickadee pairs attempt second broods, and they're rarely documented. ... Black-capped Chickadees also produce when ...Missing: multiple | Show results with:multiple
[75]
Beloved Backyard Bandits: An Introduction to Chickadees
Jan 4, 2022 · Ranging from four to six inches long, all chickadees share the same basic physical traits: white cheeks, dark crowns and throats, and gray wings ...Beloved Backyard Bandits: An... · What Is A Chickadee? · The Seven ChickadeesMissing: size weight dimorphism<|control11|><|separator|>
[76]
Distinguishing Black-capped and Carolina Chickadees
The normal range of Black-capped Chickadee is north of the hybrid zone and the normal range of Carolina south, but you can expect each species to wander a bit ...
[77]
Carolina Chickadee Overview, All About Birds, Cornell Lab of ...
The Carolina Chickadee has a black cap, black bib, gray wings and back, and whitish underside. It lives in forests, eats insects, and is found in flocks of 2-8 ...
[78]
Tricky Bird ID: Black-capped Chickadee and Carolina Chickadee
To complicate matters, the species have been known to hybridize in the overlap zone. When identifying these two chickadees, concentrate equally on the ...Missing: distribution | Show results with:distribution
[79]
Gray-headed Chickadee - All About Birds
Found primarily in northern Eurasia, where it is known as Siberian Tit, this species is also a rare resident in Alaska. More ID Info · Range map for Gray-headed ...Missing: distribution | Show results with:distribution
[80]
[PDF] Headed Chickadee in North America - Travis Booms
The gray-headed chickadee Poecile cinctus is a small songbird distributed across portions of northern Europe,. Asia, and North America. Three subspecies ...<|separator|>
[81]
Willow Tit - Poecile montanus - Birds of the World
May 23, 2025 · The Willow Tit is a small, unobtrusive passerine found across the boreal and temperate forests of the Palearctic, from Western Europe to the Russian Far East, ...
[82]
Willow Tit | BTO
Habitat is also a good indicator; Willow Tit prefer damp, young, regenerating woodland containing old dead wood and remain on or near their territory all year ...
[83]
Marsh Tit - Poecile palustris - Birds of the World
Lowland to submontane and montane mature deciduous woodland and forest with relatively high proportion of dead or rotting trees and open undergrowth, but in S ...
[84]
Black-capped Chickadee Poecile Atricapillus Species Factsheet
Note that a change in IUCN Red List category does not necessarily indicate a genuine change in the status of the species, but may simply reflect improved ...
[85]
Carolina Chickadee Life History - All About Birds
Nesting Facts ; Egg Width: 0.4 in (1.1 cm) ; Incubation Period: 12-15 days ; Nestling Period: 16-19 days ; Egg Description: White with fine dots to small blotches ...Nesting · Behavior · Food<|control11|><|separator|>
[86]
Black-capped Chickadee | State of the Mountain Birds Northeast 2025
Black-capped Chickadee numbers have increased at an annual rate of 1.81% in the spruce-fir mountain zone of the northeastern United States since 2010.
[87]
Black-capped Chickadee - Minnesota Breeding Bird Atlas
Yet vast areas in the western United States and Canada have declining populations but also regional pockets of increasing populations.
[88]
Christmas Bird Count Bibliography - National Audubon Society
Population changes in the Tufted Titmouse and Black-capped Chickadee. ... The Audubon Christmas Count as a method of monitoring nongame bird populations, pp.
[89]
93 birds on N.C. Conservation Need list | | journalpatriot.com
Urban development, deforestation and the loss of dead trees crucial for nesting cavities pose threats to black-capped chickadees as cavity nesters. Additionally ...
[90]
Mountain Chickadee - Birding Depot
Apr 13, 2025 · The Mountain Chickadee faces several potential threats, including habitat loss due to logging and deforestation, particularly in its mountainous ...<|separator|>
[91]
Climate Change: A Hybrid Zone Moves North - ScienceDirect.com
Mar 17, 2014 · A shifting zone of hybridization between two chickadee species helps us understand the proximate mechanisms driving species responses to climate change.
[92]
Chickadee research predicts drastic northward shift for southern ...
Dec 2, 2015 · Biologists know that climate change is causing southern species' ranges to move northward in the Northern Hemisphere.
[93]
How Climate Change Will Affect Birds in Maine | Audubon
At 1.5 degrees, the chickadees would retain more than half of the boreal forest to which they're adapted. View this bird >. Warming scenario: Current +1.5 ℃ + ...
[94]
Gray-headed Chickadee (Poecile cinctus): COSEWIC assessment ...
Sep 12, 2025 · The subspecies resident in Canada, P. c. lathami, is endemic to North America. Gray-headed Chickadee is one of the least understood bird species ...
[95]
Chickadees' alarm-calls carry information about size, threat of predator
Jun 23, 2005 · The calls warn other chickadees not only if a predator is moving rapidly, but also transmit information on the degree of threat posed by stationary predators ...Missing: songs | Show results with:songs
[96]
Why Chickadees Warn Other Birds But Not You - BirdWatching
Jul 13, 2025 · The primary predators that chickadees warn about are those that also threaten other small and medium-sized backyard birds: raptors (like Sharp- ...
[97]
50 CFR 10.13 -- List of Birds Protected by the Migratory Bird Treaty Act.
Carolina Chickadee, Poecile carolinensis. ; Chestnut-backed Chickadee, Poecile rufescens. ; Gray-headed Chickadee, Poecile cinctus. ; Mexican Chickadee, Poecile ...
[98]
Massachusetts State Bird, Black-capped Chickadee ... - Netstate
Sep 3, 2017 · Black-capped chickadees nest throughout southern Canada and the northern half of the United States. In Missouri, the black-capped chickadee ...
[99]
Maine State Bird | Black-capped Chickadee
A common backyard bird, black-capped chickadees inhabit the northern two thirds of the United States and much of Canada . They are found deep in the forests and ...<|separator|>
[100]
Build a Birdhouse | Audubon Delta
Build a Birdhouse. These birdhouse, or nest box, plans will help you create a protective and functional home for birds.
[101]
A Guide to Building and Placing Birdhouses Placing Information
Chickadee nest boxes should be placed on trees in wooded areas. Boreal and Chestnut-backed Chickadees prefer coniferous forests, while Black-capped Chickadees ...
[102]
What Does the Avian Flu Surge Mean for Your Bird Feeders?
Feb 24, 2025 · As officials monitor the virus, they may recommend temporarily removing feeders, avoiding certain habitat areas, reporting sick or dead birds, ...Missing: chickadee bans
[103]
Audubon California says take down bird feeders to help stop avian flu
Oct 31, 2022 · Audubon California tells homeowners to empty bird baths and take down bird feeders to discourage birds from congregating and spreading the ...Missing: chickadee conservation programs
[104]
Avian Influenza Outbreak: Should You Take Down Your Bird Feeders?
Oct 14, 2025 · That means there is currently a low risk of an outbreak among wild songbirds, and no official recommendation to take down feeders unless you ...