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Anhinga

The Anhinga (Anhinga anhinga), also known as the snakebird, darter, or water turkey, is a slender, blackish waterbird renowned for its serpentine neck and remarkable underwater hunting prowess.^[1]^[2]^[3] Native to subtropical and tropical regions, this species measures 75–96 cm in length with a wingspan of 1.17 m, featuring a long, pointed bill, partially webbed feet, and a distinctive fan-like tail used in courtship displays and maneuvering.^[4] Its plumage is glossy black in males with silvery wing coverts, while females exhibit a brownish hue, and both sexes share a striking red eye.^[3] The name "Anhinga" derives from the Tupi language of Brazil, meaning "devil bird," reflecting its eerie silhouette when swimming.^[1]^[2] Classified in the family Anhingidae within the order Suliformes, the Anhinga is one of four species in the genus Anhinga, with its closest relatives being other darters found in Africa, Asia, and Australia.^[5] It inhabits warm, shallow freshwater and brackish wetlands, including marshes, swamps, slow-moving rivers, ponds, and mangrove-lined lagoons, requiring nearby perches like logs or branches for sunning and drying its feathers after dives.^[3]^[1]^[6] The bird's range spans from the southeastern United States (south of Virginia) through Central America to northern South America, with year-round residency in most areas and some seasonal movements northward in summer; populations are stable and not currently threatened, though habitat loss poses localized risks.^[1]^[7]^[4] An adept swimmer and diver, the Anhinga propels itself underwater using its feet, submerging its torpedo-shaped body while keeping its snakelike neck and head visible to stalk prey, which it spears with rapid thrusts of its dagger-like bill.^[8]^[1]^[3] Its diet primarily consists of fish, supplemented by amphibians, crustaceans, and insects.^[4]^[6] Unlike many waterbirds, its feathers are not waterproof, allowing quick heat loss during hunts but necessitating frequent sunbathing with wings spread wide to dry and regulate body temperature—a behavior often seen in social groups.^[1]^[8] In flight, it soars gracefully on broad wings, sometimes reaching heights of 1,000 m, and is a colonial nester, building stick platforms in trees over water alongside herons and ibises, where females lay 2–6 pale blue-green eggs incubated by both parents for about 25 days.^[1]^[3]^[4] The young, which are altricial at hatching, are fed by both parents and remain in the nest until fledging at about 6 weeks.^[8]

Taxonomy and etymology

Scientific classification

The Anhinga belongs to the order Suliformes, which encompasses a diverse group of waterbirds including cormorants, gannets, and boobies, and is classified within the family Anhingidae, a monotypic family comprising the single genus Anhinga that contains four extant species distributed across tropical and subtropical regions worldwide.^[9]^[10] The American anhinga, native to the Americas, is formally designated as Anhinga anhinga (Linnaeus, 1766), distinguishing it from its three congeners: the African darter (A. rufa), the Oriental darter (A. melanogaster), and the Australasian darter (A. novaehollandiae).^[7]^[11]^[12] Fossil evidence indicates that the Anhingidae diverged from the closely related family Phalacrocoracidae (cormorants) approximately 30–40 million years ago, with the oldest anhingid fossils dating to the late Oligocene around 25 million years ago, and species like Anhinga pannonica appearing in the late Miocene around 11–12 million years ago.^[13]^[14]^[15]^[16] Phylogenetically, Anhingidae forms a strongly supported sister clade to Phalacrocoracidae within Suliformes, reflecting their shared adaptations for aquatic foraging, yet the families are distinguished by unique derived features in Anhingidae, such as the specialized morphology of cervical vertebrae 5–7, which feature a ventral keel for enhanced muscle attachment and neck flexibility.^[17]^[10]^[15]

Naming and synonyms

The name "Anhinga" originates from the Tupi language spoken by indigenous peoples in Brazil, where it is derived from the term a'ñinga or anhangá, meaning "devil bird" or "snake bird."^[2]^[1] This etymology reflects the bird's eerie appearance when swimming, with only its slender, serpentine neck and head visible above the water, evoking a snake, and its association in Tupi folklore with malevolent spirits of the forest.^[18]^[19] In North America, the Anhinga has been historically known by several common synonyms that highlight its physical traits and behaviors, including "water turkey," referring to its fan-shaped tail resembling that of a wild turkey, and "darter," alluding to its rapid underwater pursuits of fish.^[20]^[21] The nickname "snakebird" is also widespread, emphasizing the bird's elongated neck and low-slung swimming posture.^[2] Regionally, the Anhinga is called the "American darter" to distinguish it from similar species in other continents, and other indigenous names vary, though specific terms like those from South American tribes beyond Tupi are less documented in English sources.^[22]^[23] The species received its first scientific description from Carl Linnaeus in the 12th edition of Systema Naturae in 1766, as Plotus anhinga. The genus Anhinga was introduced by Mathurin Jacques Brisson in 1760, and the species is now classified as Anhinga anhinga. Subsequent reclassifications in the 19th and 20th centuries refined its taxonomy within the family Anhingidae, reflecting advances in understanding its relation to cormorants.^[12]^[5]^[13]

Physical description

Morphology and size

The Anhinga (Anhinga anhinga) is a large, slender bird with morphological adaptations suited to its semi-aquatic foraging. It typically measures 75–96 cm in total length, possesses a wingspan of about 117 cm, and weighs 1.1–1.4 kg, though averages are around 85 cm in length and 1.35 kg in mass.^[4] Males are slightly larger overall than females, exhibiting minimal sexual size dimorphism with males averaging 5–10% heavier. A defining feature is the elongated, S-shaped neck, which accounts for a significant portion of the bird's length and supports a straight, sharp-pointed bill approximately 8 cm long, forming a spear-like apparatus for impaling prey. The neck's flexibility derives from specialized cervical vertebrae, including a hinge-like joint between the eighth and ninth, enabling swift, forceful thrusting motions during hunting.^[1] The wings are long, broad, and pointed, enabling efficient soaring flight as well as aiding in underwater propulsion, while the long, stiff tail—comprising up to 30% of body length—functions as a rudder for maneuvering in water. Skeletal modifications enhance this aquatic specialization, such as a non-pneumatic sternum with limited internal air spaces, which contributes to overall bone density and allows neutral buoyancy for prolonged submergence.^[24]

Plumage and sexual dimorphism

The adult plumage of the Anhinga exhibits marked sexual dimorphism. Males possess glossy black feathers overall, with distinctive silvery-gray upperwing coverts and scapulars that create a shimmering effect when dry; during the breeding season, they develop a small crest on the head and elongated silvery-white plumes on the back and wings.^[20] Females, in contrast, display a duller brown plumage, featuring a buff or pale tan head, neck, and upper breast that transitions to darker brown on the body and wings, lacking the silvery highlights and plumes of males. Both sexes have bright red eyes.^[25]^[4]^[3] Juveniles are uniformly brownish, resembling females but with less contrast and no crest, gradually acquiring adult-like patterns over the first year.^[4] Anhingas undergo an annual post-breeding molt that includes the simultaneous replacement of all primary and secondary flight feathers, resulting in a temporary flightless period lasting several weeks while new feathers grow.^[4] This unusual molt strategy, unique among suliform birds, occurs primarily in late summer or fall and renders the bird reliant on swimming and climbing for mobility. The feathers of the Anhinga are specialized for an aquatic lifestyle, lacking the dense oil coating found in many waterbirds like ducks, which allows them to become fully wettable and sink efficiently for underwater pursuit of prey.^[2] This adaptation reduces buoyancy but leads to rapid heat loss and prolonged drying times, necessitating extended perching with wings outstretched to absorb solar radiation and restore insulation.^[2]^[4]

Distribution and habitat

Geographic range

The Anhinga (Anhinga anhinga), also known as the American darter, has a native range spanning subtropical and tropical wetlands across the Americas, from the southeastern United States—where it breeds from coastal Texas eastward to Florida and northward to parts of South Carolina and Oklahoma—southward through Mexico and Central America to South America, extending east of the Andes from Colombia and Ecuador to northern Argentina.^[26]^[3]^[27] This distribution encompasses a broad latitudinal gradient, with the species primarily resident in southern portions of its range but showing partial migration in northern areas.^[26] Disjunct populations are found in isolated pockets outside the continuous range, including scattered sites in central and southern Mexico as well as Caribbean islands such as Cuba and Trinidad and Tobago.^[4]^[5] Vagrant individuals have been recorded well outside the typical range, with notable sightings in California, including a single flight observation in San Mateo County, and more recent extralimital appearances in northeastern states like New York and Maine.^[28]^[29] The Anhinga exhibits no sympatry with its three congeners—Anhinga rufa (African darter), Anhinga melanogaster (Oriental darter), and Anhinga novaehollandiae (Australasian darter)—which are confined to the Old World.^[4] Within its range, it commonly co-occurs with superficially similar species like the double-crested cormorant (Nannopterum auritum), sharing foraging and roosting sites in freshwater and coastal wetlands.^[3]^[6] Historically, the Anhinga's North American range has undergone a northward expansion, beginning in the 1930s with breeding documented in North Carolina and continuing into the 1940s with confirmed nests in Virginia and further inland states like Kansas and Oklahoma.^[30] This shift, which has led to recent breeding attempts as far north as Maryland as of 2022, is largely attributed to climate warming that has extended suitable conditions beyond previous limits, with ongoing expansions noted through 2024.^[31]^[29]^[7]

Habitat preferences and migration

The Anhinga (Anhinga anhinga) inhabits a variety of warm aquatic environments, favoring freshwater swamps, marshes, and slow-moving rivers where dense vegetation such as cypress trees, mangroves, and emergent plants provides essential perching, nesting, and cover sites.^[4] These habitats often include shrub- or tree-covered islands and shores adjacent to lakes, shallow coastal bays, and lagoons, allowing the bird to access suitable roosting spots for drying its non-waterproof plumage after submerging.^[8] The species shows a strong preference for sheltered, slow-flowing waters over fast-moving streams, and while it primarily occupies freshwater systems, it tolerates brackish conditions in mangrove swamps but avoids highly saline marine environments except during extreme droughts.^[3] Microhabitat requirements emphasize shallow depths conducive to underwater stalking, frequently less than 0.5 meters, where the bird can pursue prey amid aquatic vegetation without deep dives that would hinder its pursuit-diving strategy.^[32] Proximity to perches like snags, branches, or banks is critical for thermoregulation, as individuals must frequently emerge to sun and dry their feathers, a behavior that underscores the need for structurally complex wetlands with both open water and vegetated edges.^[1] In terms of mobility, the Anhinga is predominantly non-migratory across its tropical range from southern South America to Central America, where stable warm conditions support year-round residency.^[4] However, northern populations in the southeastern and south-central United States exhibit partial short-distance migration, with individuals departing breeding areas in states like North Carolina and Texas from October onward to overwinter in Florida, Louisiana, the Gulf Coast, or Mexico, returning northward in March–April.^[26] These movements are primarily driven by declining temperatures and reduced sunlight, which impair the bird's ability to maintain body heat after foraging.^[33]

Behavior and ecology

The Anhinga exhibits specialized locomotion adapted to its aquatic lifestyle. It is an agile swimmer underwater, propelling itself with its large, webbed feet while wings may be slightly opened as stabilizers, maintaining near-neutral buoyancy due to its dense bones and wettable plumage, allowing the body to remain submerged with only the head and long neck visible above the surface.^[34] On land, the bird moves awkwardly, appearing clumsy due to its legs being positioned far back on the body, which are primarily adapted for perching and climbing rather than terrestrial locomotion; it waddles unsteadily when walking short distances between water and perches.^[34] In flight, Anhingas employ direct, strong flapping interspersed with gliding, often soaring at high altitudes on thermal updrafts with wings held flat and the neck extended forward, though they require an initial launch from an elevated perch and cannot take off directly from water like some related species.^[34] After swimming, individuals frequently perch on branches or snags overhanging water, spreading their wings to dry the feathers, a behavior essential for thermoregulation as the plumage absorbs water and loses heat rapidly.^[8] Anhingas are diurnal, typically active during daylight hours with routines centered on morning and midday activities near water bodies, followed by evening roosting in trees or shrubs overhanging wetlands to avoid predators.^[34] Outside the breeding season, territorial defense is minimal, with individuals showing little aggression toward conspecifics except at preferred roosting or sunning sites during winter.^[34] Socially, Anhingas are generally solitary or occur in loose pairs during non-breeding periods, foraging independently but occasionally associating with other waterbirds like herons or cormorants.^[4] However, they form mixed-species flocks of 10 to several hundred at communal roosts, particularly in the evening, and may gather in loose aggregations during the non-breeding season for resting or sunning.^[3] Communication occurs primarily through low grunts, raspy croaks, harsh hisses, and clicking or chattering sounds, used in agonistic interactions or basic alerts rather than complex songs.^[34]

Foraging techniques

The Anhinga primarily forages using a combination of stealth and pursuit diving in shallow waters, submerging neck-first to stalk prey silently while propelling itself with large webbed feet. It patrols the edges of aquatic vegetation or open areas, often keeping only its head and long, serpentine neck above the surface to remain inconspicuous, before diving fully upon spotting potential targets. This technique allows it to approach fish undetected, striking with a rapid thrust of its sharply pointed bill to impale prey through the body; captured items are then brought to the surface, tossed in the air, and swallowed headfirst.^[8]^[3]^[4] Key adaptations enhance this hunting efficiency, including wettable plumage that lacks preen oil for waterproofing, resulting in reduced buoyancy and near-neutral flotation for stealthy, low-profile swimming. Dense bones further aid submersion, while the bird's large eyes and high retinal cone density provide excellent underwater vision for detecting and targeting prey from afar. Dives typically last 20–60 seconds.^[35]^[8]^[4] Foraging is confined to shallow, slow-moving freshwater habitats such as marshes, swamps, and ponds typically less than 3 m deep, where the Anhinga swims slowly or perches at the water's edge before launching dives; it rarely ventures into saltwater except during droughts and avoids deep or fast-flowing waters.^[35]^[8]^[3]^[36] Activity is diurnal, with nocturnal foraging undocumented and considered rare. While usually solitary during hunts, it may forage near other waterbirds without direct interaction.^[8]^[3]^[36] This intensive strategy incurs high energy costs, with dive frequencies reaching up to 30 per minute during peak activity, necessitating frequent surface intervals for breathing and drying. As a specialist piscivore, the Anhinga exerts ecological influence by preying on small- to medium-sized fish, thereby helping regulate populations in wetland ecosystems and maintaining aquatic food web dynamics.^[35]^[8]

Reproduction and life cycle

Breeding season and courtship

The breeding season of the Anhinga (Anhinga anhinga) varies by latitude, occurring year-round in tropical regions but seasonally from March to July in temperate areas such as the southeastern United States.^[4]^[37] This timing is primarily triggered by increased rainfall and the resulting abundance of food resources, which support the energetic demands of reproduction. Courtship begins with males performing aerial displays, including high soaring flights and horizontal gliding to attract females and advertise potential nesting sites.^[4] Once a female approaches, the male initiates ground-based rituals, such as wing-waving—alternately flapping and spreading his wings to reveal silvery plumage on the undersides—accompanied by neck-thrusting and bowing motions where the head and neck are extended and swayed side to side.^[38] Pairs may also engage in synchronized bill-snapping duets, producing sharp clicking sounds while intertwining necks, which reinforces their bond.^[36] Anhingas are typically monogamous for the breeding season, with females selecting mates based on the vigor and elaboration of these displays, though occasional extra-pair copulations have been observed.^[4] Pairs often exhibit strong site fidelity, returning to the same territories and reusing nests annually to minimize effort in site selection.^[4]

Nesting and parental care

Anhingas build nests as shallow platforms composed of sticks, typically situated 1–6 m above the ground or water and overhanging water bodies to facilitate escape for the young.^[5]^[8] The male collects most nesting materials, including large sticks and green foliage, and places them in suitable tree forks, while the female shapes the structure and adds a lining of leaves and finer twigs.^[8] Pairs often reuse nests from previous seasons but may construct new ones annually, particularly in colonial settings with other waterbirds.^[4] Clutch sizes range from 2 to 5 pale bluish-green eggs, with an average of about 3.8 eggs reported in southern U.S. populations.^[39] Incubation begins with the first egg and lasts 25–30 days, shared by both parents; females typically incubate at night, and males during the day.^[8] Hatching chicks are semi-altricial, emerging naked with eyes open and helpless, requiring continuous brooding for the first two weeks.^[8]^[39] Both parents feed the young regurgitated fish, with provisioning continuing intensively until fledging; by two weeks of age, chicks may leap from the nest into water to evade predators, demonstrating early swimming ability, but they return to the nest for feeding.^[39] Fledging occurs at approximately 6 weeks, after which young remain dependent on parents for food for an additional 2–4 weeks before achieving full independence.^[6]^[20] Breeding success is variable, with approximately 70% of nests in coastal Florida fledging at least one young, though rates can be lower due to factors such as predation by raccoons and adverse weather; overall egg loss averages around 44%.^[40]

Diet and feeding ecology

Prey species

The diet of the Anhinga (Anhinga anhinga) is dominated by fish, which constitute the vast majority of its food intake, often exceeding 98% of identifiable prey items in examined stomach contents from southern Florida populations.^[41] Specific fish species frequently consumed include members of the families Poeciliidae (such as mosquitofish, Gambusia spp.), Centrarchidae (such as bluegill, Lepomis spp.), Cyprinodontidae (killifishes), and Percidae (perches), along with catfish (Ictaluridae) and other small wetland fishes like mullet (Mugil spp.), pickerel (Esox spp.), suckers (Catostomidae), and gizzard shad (Dorosoma cepedianum).^[41]^[3] In one analysis of 11 non-empty stomachs from Florida, 151 prey items were identified, with fish comprising over 98% and Poeciliidae alone accounting for 56.3%, Centrarchidae 24.5%, Cyprinodontidae 13.7%, and Percidae 5.5%.^[41] Secondary prey items make up a minor portion of the diet and include amphibians such as frogs and salamanders, aquatic insects, crustaceans like crayfish, and occasional small reptiles.^[3]^[4]^[41] These non-fish items are more commonly observed in areas with concentrated prey availability, such as shallow wetlands, but remain infrequent overall.^[8] Anhingas exhibit size selectivity in their piscivory, targeting small- to medium-sized fish typically ranging from 5 to 15 cm in length, though they can occasionally handle larger individuals up to 24 cm.^[8]^[41] Seasonal shifts occur in some regions, with increased consumption of invertebrates during dry periods when fish availability decreases in shrinking water bodies.^[4] As piscivorous specialists, Anhingas occupy a top trophic level in aquatic ecosystems, with diet composition varying regionally—for instance, incorporating more eels or other elongated species in mangrove habitats of tropical areas.^[8]^[3]

Hunting adaptations

The Anhinga's bill is a key adaptation for underwater predation, featuring a long, straight, and sharply pointed structure with minute inward-pointing serrations along the edges of the mandibular tips that facilitate impaling and securely holding slippery fish prey.^[4] These serrations prevent captured prey from escaping during the bird's return to the surface, while powerful neck and jaw muscles enable rapid, precise thrusts to spear fish through their sides with a partially opened bill.^[8] This impaling technique contrasts with grasping methods used by related species, emphasizing the Anhinga's specialization for stabbing motions in close-range encounters.^[42] Sensory adaptations support the Anhinga's ability to hunt effectively in murky freshwater environments, where it stalks prey slowly underwater around submerged vegetation.^[8] Like many diving birds, it employs a nictitating membrane—a transparent third eyelid—to protect and moisten its eyes during submersion, potentially enhancing visual acuity by reducing glare and maintaining clarity in low-light aquatic conditions.^[43] To maximize energy efficiency during dives, Anhingas exhibit physiological traits that conserve oxygen, including a lower basal metabolic rate and reliance on glycolysis for ATP production rather than aerobic pathways, allowing prolonged submersion with minimal movement.^[44] They achieve neutral buoyancy through wettable plumage and dense bones, reducing the energy cost of propulsion, and likely employ diving bradycardia—a reduction in heart rate—to further limit oxygen consumption, similar to other pursuit divers.^[45] Post-dive, Anhingas spread their wings in a semicircular posture to dry saturated feathers and facilitate thermoregulation by absorbing solar heat, compensating for their high thermal conductance and low endogenous heat production.^[6] This behavior not only restores waterproofing but also aids recovery by offsetting heat loss incurred during foraging.^[46] In comparative ecology, the Anhinga is a more specialized underwater diver than herons, which primarily hunt from the surface with stabbing strikes and lack adaptations for prolonged submersion.^[47] Unlike the more versatile double-crested cormorant, which pursues prey actively in deeper or saline waters using higher aerobic capacity and a hooked bill for grasping, the Anhinga employs a patient, ambush-style predation in shallow freshwater, relying on stealth and lower oxygen demands for efficiency.^[48] These distinctions highlight the Anhinga's niche as an energy-conserving specialist in tropical wetland ecosystems.^[44]

Conservation and human interactions

Population status and threats

The global population of the Anhinga (Anhinga anhinga) is estimated at 50,000–200,000 individuals (2012), equivalent to 33,300–133,000 mature individuals, and is classified as Least Concern by the IUCN due to its large range across the Americas.^[7] Overall, the population appears stable, though trends vary regionally; in North America, particularly Florida, numbers have increased by approximately 4.3% annually in breeding areas, likely linked to improved wetland conditions.^[40] In contrast, comprehensive recent trend data are limited for South America, where ongoing habitat loss poses risks.^[7] Major threats to the Anhinga include wetland drainage for agricultural expansion, which fragments breeding and foraging habitats across its range.^[8] Pollution poses a significant risk, particularly mercury bioaccumulation in aquatic food chains, leading to elevated concentrations in tissues of individuals in contaminated areas like the Florida Everglades, where levels have historically exceeded thresholds for reproductive effects.^[49] Climate change exacerbates these pressures by altering water levels and hydroperiods in wetlands, potentially reducing prey availability and nesting success.^[3] Additionally, collisions with infrastructure, including discarded fishing lines and power lines, result in direct mortality, especially for juveniles.^[8] The species comprises two recognized subspecies—A. a. anhinga in much of South America and A. a. leucogaster in Central and North America—but no subspecies are considered threatened; however, local populations remain vulnerable to the aforementioned threats due to their dependence on dynamic wetland ecosystems.^[13]

Conservation measures

The Anhinga (Anhinga anhinga) receives legal protection under the U.S. Migratory Bird Treaty Act of 1918, which safeguards over 1,000 native bird species by prohibiting their unauthorized take, possession, sale, or transport without a permit.^[50] This federal legislation implements international treaties aimed at conserving migratory birds across the Americas, ensuring habitat integrity and population stability for resident species like the Anhinga.^[51] Additionally, habitat protections are bolstered by the Ramsar Convention on Wetlands, with designated sites such as the Pantanal Matogrossense in Brazil providing safeguards for critical wetland ecosystems that support Anhinga breeding and foraging. Restoration efforts in key habitats have focused on rehydrating degraded wetlands to enhance water flow and vegetation, directly benefiting Anhinga populations. In the Florida Everglades, the Comprehensive Everglades Restoration Plan implements projects like the Central Everglades Planning Project, which restores natural hydrology and reduces pollution to support wetland-dependent birds. Population monitoring occurs through citizen science programs, including the annual Christmas Bird Count organized by the National Audubon Society, which tracks Anhinga distribution and abundance trends across North America to inform conservation strategies. Human interactions with the Anhinga are generally positive, with the bird featuring in indigenous cultures; the Tupi people of Brazil named it anhinga, meaning "devil bird" or "snake bird," reflecting its serpentine appearance and earning it a place in traditional lore.^[52] Conflicts with fisheries remain minimal, primarily involving incidental entanglement in discarded lines rather than significant predation on commercial stocks, unlike more problematic piscivores such as cormorants.^[8] Ecotourism in Brazil's Pantanal region promotes Anhinga conservation by attracting visitors to observe the species in its natural wetland habitat, generating revenue for protected area management.^[53] Recent research post-2020 has addressed gaps in understanding climate impacts, with observations of northward range expansions—such as increased sightings in northern states like New Jersey in 2023 and the first confirmed record in Maine in 2025—indicating potential shifts driven by warming temperatures and altered wetland conditions.^[54]^[55] These studies emphasize the need for adaptive habitat management to mitigate future vulnerabilities in Anhinga populations.^[56]

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[30]
Anhinga reaches Maine for first time - BirdGuides
Aug 12, 2024 · However, the species is slowly expanding its range northward, chiefly due to climate change. Maryland is now the northernmost location where ...
[31]
None
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[32]
Movements and Migration - Anhinga - Birds of the World
Short-distance partial migrant. Moves regularly between summer nesting habitat in se. and s.-central U.S. to Florida, Louisiana, and Mexico in winter.Missing: preferences | Show results with:preferences
[33]
Conservation and Management - Anhinga - Birds of the World
This wetland species probably declined to some degree as result of the 50% loss of habitat thought to have occurred in the U.S. during the twentieth century.
[34]
https://doi.org/10.2173/bow.anhing.01
[35]
Diving in shallow water: The foraging ecology of darters (Aves
Aug 9, 2025 · In this study I provide more extensive observations of African darters Anhinga melanogaster rufa diving in water<5 m deep at two sites. Dive ...
[36]
Behavior - Anhinga - Birds of the World
Skeletal adaptations and musculature of tail allow intricate movements and large range of motion (Owre 1967a. (1967a). Adaptations for locomotion and feeding ...Missing: anatomy | Show results with:anatomy
[37]
Anhinga | The Texas Breeding Bird Atlas
BREEDING HABITAT: The Anhinga is colonial and typically nests in small aggregations along with much larger numbers of herons, egrets, ibises and cormorants.Missing: classification | Show results with:classification
[38]
[PDF] NOTES ON THE BREEDING BEHAVIOR OF THE ANHINGA
A male Anhinga in full breeding plumage is mostly black, glossed with green ... Anhinga sexual dimorphism is shown by the fawn head and neck of the female.Missing: camouflage | Show results with:camouflage
[39]
Breeding - Anhinga - Birds of the World
Breeding is earlier in Mexico on Caribbean than Pacific Coast, during late dry season. Little is known about timing of breeding elsewhere in Tropics. First/Only ...
[40]
Demography and Populations - Anhinga - Birds of the World
Little information; territorial in winter at roosts and feeding sites, suggesting at least temporary site fidelity in winter. No information on site fidelity ...Demography And Populations · Measures Of Breeding... · Population Spatial Metrics<|control11|><|separator|>
[41]
Diet and Foraging - Anhinga - Birds of the World
Mar 1, 2020 · Usually forages alone, swimming slowly and stalking underwater in and around aquatic vegetation. Wings are often cocked open underwater.Missing: depth meters
[42]
(PDF) Comparative mechanisms for O2 storage and metabolism in ...
Aug 6, 2025 · In particular, the anhinga exhibits a unique diving phenotype with a slightly higher reliance on glycolysis and lower aerobic ATP generation ...
[43]
The Eyes Have It: Wild Ocular Adaptations - South Carolina Aquarium
transparent or translucent — that offers protection and a moisture barrier, but allows the animals to ...
[44]
Sensory Evolution on the Threshold: Adaptations in Secondarily ...
anatinus has an electric organ for locating prey underwater. ... The lower lid can be closed over the eye, and a nictitating membrane is present.
[45]
Comparative mechanisms for O2 storage and metabolism in two ...
Dec 20, 2024 · The anhinga exhibits a unique diving phenotype with a slightly higher reliance on glycolysis and lower aerobic ATP generation than double-crested cormorants.
[46]
https://web.stanford.edu/group/stanfordbirds/text/essays/Spread-Wing_Postures.html
[47]
Spread-Wing Postures
Anhingas, for example, have unusually low metabolic rates and unusually high rates of heat loss from their bodies. Whether wet or dry, they exhibit spread-wing ...Missing: dive | Show results with:dive
[48]
Florida's waterbirds: Expert divers with bold hunting techniques
Jan 19, 2025 · In contrast, anhingas are stealthy ambush predators. Rather than chasing fish, they wait patiently in shallow water, camouflaged among ...<|separator|>
[49]
New insights about Florida's most common diving birds
Jan 17, 2025 · The research indicates that they also consume more oxygen to do this. Meanwhile, anhingas are more sedentary and lie in wait in shallower waters ...
[50]
[PDF] Frederick et al. 04 A historical record of mercury contamination.pdf
In aquatic systems, mercury is likely to impact biota because of high bioaccumulation potential, high bio- ... The similarity of the anhinga contamination pattern ...
[51]
50 CFR 10.13 -- List of Birds Protected by the Migratory Bird Treaty Act.
§ 10.13 List of Birds Protected by the Migratory Bird Treaty Act. ; Anhinga, Anhinga, Anhinga anhinga. ; Ani, Groove-billed Ani, Crotophaga sulcirostris. ; Smooth- ...
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Migratory Bird Treaty Act of 1918 | U.S. Fish & Wildlife Service
The Migratory Bird Treaty Act ensures sustainability of protected migratory birds and prohibits their take without authorization. It applies to native species.
[53]
Anhinga | U.S. Fish & Wildlife Service
Mar 31, 2022 · The Anhinga's diet is mostly fish. Anhinga are only occasional visitors on Alligator River Refuge. Black bird with wings spread standing on ...
[54]
Brazil and Argentina: The Pantanal and Iguazu Falls - Birding Ecotours
Our river trips provide the opportunity to look for species such as Capped Heron, Sungrebe, the striking Agami Heron, Anhinga and a plethora of kingfishers ...
[55]
Rare 'devil bird' sightings are up in N.J. What does it say about ...
Sep 18, 2023 · The Anhinga is commonly found in southeastern swamps so the bird's increased presence in New Jersey is peculiar, experts said.
[56]
Survival by Degrees: 389 Bird Species on the Brink | Audubon
Audubon's new climate report warns of massive avian loss if we don't change course and stabilize global carbon emissions. News.Atlantic Flyway · Mississippi Flyway · Pacific Flyway · Central FlywayMissing: Anhinga 2023