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Redwing

The redwing (Turdus iliacus) is a small passerine bird in the thrush family Turdidae, native to Europe and the western Palearctic, measuring 20–24 cm in length with a wingspan of 33–35 cm.^[1]^[2] It is characterized by its brown upperparts, pale underparts with dark streaks on the breast, a prominent creamy-white supercilium (eyebrow stripe), and distinctive orange-red patches on the flanks and underwing coverts, which are most visible in flight.^[1]^[3] Slightly smaller than the related song thrush (Turdus philomelos), the redwing is the smallest true thrush regularly observed in the United Kingdom, where it is primarily a winter visitor rather than a breeder.^[3]^[2] Breeding across northern Europe including Scandinavia and Iceland, and northern Russia in open woodlands, coniferous forests, and scrubby areas, the redwing constructs a cup-shaped nest of grass, moss, and twigs lined with mud or feathers, typically low in trees or shrubs, usually less than 4 m above ground.^[4]^[2]^[5] Females lay 4–6 pale blue-green eggs speckled with brown, incubating them for 12–14 days while males provide food; fledglings leave the nest after about 13 days.^[2] The diet shifts seasonally: during breeding, it consists mainly of invertebrates such as earthworms, snails, and insects foraged on the ground; in winter, it relies heavily on berries from hedgerows, orchards, and gardens, with large flocks forming when northern food sources are scarce.^[3]^[2] Its song is a series of simple, descending liquid notes delivered from a high perch, varying by dialect across regions, while calls include a sharp "seep" or buzzy "dsssi" for alarm.^[1] The redwing is highly migratory, with northern populations traveling south and west to winter in western Europe, including the UK, Ireland, and Iberia, often in mixed flocks with fieldfares (Turdus pilaris); vagrants occasionally reach North America, particularly Newfoundland.^[1]^[2] Populations are stable overall, classified as Least Concern by the IUCN due to its wide range and adaptability, though it faces threats from habitat loss, climate change affecting berry crops, and hunting in some southern European countries.^[1]^[2] In the UK, it is on the Amber List of conservation concern, reflecting moderate declines in some areas but strong winter passage numbers.^[3]

Taxonomy and systematics

Etymology and naming

The common name "redwing" derives from the bird's distinctive reddish-orange patch on the underwing coverts, which becomes prominently visible during flight.^[6] The scientific name Turdus iliacus originates from Latin, with Turdus meaning "thrush," reflecting its membership in the thrush group, and iliacus derived from ilia, referring to the flanks or hips, in allusion to the species' reddish coloration on the flanks.^[2] This binomial was formally established by Carl Linnaeus in the 10th edition of Systema Naturae in 1758, although subsequent publications by Linnaeus in 1766 and 1767 introduced some nomenclatural confusion regarding synonyms like Turdus musicus, leading various authors to variably attribute the description to either 1758 or 1766; the 1758 date is now accepted as the original authority.^[7] No major taxonomic revisions to the species' naming have occurred since, with the most recent comprehensive review in 2024 confirming its stability.^[7] The redwing is classified within the family Turdidae, the thrushes, and the genus Turdus, where it shares close phylogenetic relations with other Palearctic species such as the song thrush (Turdus philomelos), with which it exhibits morphological and behavioral similarities.^[7]^[8]

Subspecies and classification

The redwing (Turdus iliacus) is classified within the thrush family Turdidae and the genus Turdus, with two recognized subspecies based on geographic variation and morphological differences.^[9] The nominate subspecies, T. i. iliacus, breeds across northern Europe from Scandinavia eastward to central Siberia and winters in western and southern Europe, North Africa, and the Near East; it is characterized by paler, warmer brown upperparts, narrower and more distinct dark streaking on the whitish underparts, a vague breast band, a narrower pale eyeline, a larger pale patch on the rear flanks, and paler legs, with an average size of about 21 cm in length.^[9]^[10] In contrast, T. i. coburni breeds in Iceland and the Faroe Islands and winters mainly in western Europe; it is slightly larger (about 3% longer on average, reaching 22 cm), with darker, colder brown upperparts, broader and darker streaking on the underparts that often forms solid dark patches and a more defined breast band, a broader dark eyeline, a reduced pale flank patch, and darker legs.^[9]^[10] Phylogenetic analyses confirm the monophyly of the genus Turdus, placing T. iliacus within a Palearctic clade as the sister species to the Eurasian blackbird (T. merula), with strong support from ultraconserved element (UCE) genomic data; this relationship highlights the genus's complex biogeographic history involving multiple dispersals between the Old and New Worlds.^[7]^[11] A 2020 phylogenomic study estimated the divergence of the T. iliacus–T. merula lineage from other Palearctic thrushes around 5–7 million years ago, reflecting ancient diversification within the genus.^[11] Hybridization between T. iliacus and T. merula has been documented in Europe, though such events are rare and typically occur in overlapping wintering or breeding ranges.^[12]

Physical characteristics

Plumage and coloration

The redwing (Turdus iliacus) exhibits a plumage characterized by brownish-olive upperparts, including the crown, back, and rump, which provide effective camouflage in its woodland habitats. A prominent pale supercilium extends from the bill over the eye, contrasting with the darker ear coverts and giving the bird a distinctive facial pattern. The underparts are cream-colored with bold dark streaks, particularly dense on the breast and sides, creating a mottled appearance.^[13]^[14] One of the most striking features is the reddish-orange coloration of the axillaries and underwing coverts, which becomes vividly apparent during flight or when the wings are spread, distinguishing the redwing from similar thrushes. The flanks also show rusty-red patches, enhancing this diagnostic trait. Sexual dimorphism is minimal, with males and females displaying nearly identical plumage patterns and colors, though males may average slightly brighter tones in breeding condition.^[15]^[13]^[14] Juveniles possess plumage similar to adults but with notable differences: the upperparts appear scaly due to buffy fringes on the feathers, and the underparts feature spots rather than streaks, especially on the breast where the spots are largest and more rounded. These young birds undergo a post-juvenile moult, typically completing it by late summer, to acquire adult-like streaked underparts and smoother upperparts.^[15]^[13] Seasonal variations primarily involve feather wear, with fresher plumage in autumn appearing more vibrant and olive-toned, while winter birds show faded, abraded edges without significant color shifts. Subtle differences exist among subspecies, such as the Icelandic T. i. coburni having redder flanks and more saturated underparts compared to the paler nominate T. i. iliacus.^[15]^[7]^[16]

Size, measurements, and morphology

The redwing (Turdus iliacus) measures 20–24 cm in length, with a wingspan of 33–35 cm and a body mass ranging from 50–75 g, averaging approximately 62 g.^[4]^[17] These dimensions position the redwing as one of the smaller species within the genus Turdus, notably more compact than the larger blackbird (T. merula) at around 24 cm in length and heavier congeners like the song thrush (T. philomelos), which shares a similar length but exceeds 70 g on average.^[18]^[4] The bill is slender and straight to slightly decurved, with a dark brown to blackish upper mandible and a yellow base on the lower mandible, facilitating precise manipulation of food items.^[13]^[4] The legs and feet are pinkish to grayish pink, featuring robust tarsi and toes that support terrestrial locomotion typical of thrushes.^[4]^[19] Wing morphology includes long, pointed primaries that enhance aerodynamic efficiency for long-distance migration, with a wing chord measuring 11.8–13.6 cm.^[17] This structure, combined with the bird's overall compact build, aids in sustained flight across its Palearctic breeding grounds to wintering sites in Europe.^[4]

Vocalizations

Song characteristics

The song of the redwing (Turdus iliacus) is a short phrase of simple, monotonous structure consisting of introductory clear notes followed by a twittering trill, typically delivered from an elevated perch such as a tree branch.^[20] It lasts 2–3 seconds and is often described as sweet descending notes with twittery burbling, such as "trúi-trúi-trúi trip-trr-bziriri-rrit."^[20] This distinguishes it from the more complex songs of related thrushes.^[20] Most males sing one song type, though some use two distinct variants, enabling subtle differences in phrasing and tempo that contribute to individual recognition.^[21] At least 38 regional dialects are known from southern Norway, with song patterns varying across populations due to cultural transmission and local ecological conditions, as documented in long-term studies of Scandinavian breeding sites.^[20]^[22] These dialects maintain conformity within groups but show gradual changes over time, reflecting ongoing evolution in song structure.^[23] The song serves dual functions in territorial defense and mate attraction, with singing rates highest in early spring upon territory establishment and pair formation.^[24] Playback experiments confirm that males respond aggressively to conspecific songs, particularly the twittering section, underscoring its role in intra-sexual competition.^[25] The song is dominated by whistles in the introductory part and rapid trills in the concluding twitter, which enhance detectability in forested habitats. Song amplitude and structure also signal male arousal levels during interactions.^[26] Environmental factors influence song variation, with habitat acoustics shaping phrase degradation and transmission. Unlike alarm calls, which are shorter and more abrupt, the song's elaborate form is reserved for breeding contexts.^[13] A subsong, consisting of low twittering, is produced by flocks during migration or winter, and by juveniles starting at 17–18 days old.^[20]

Calls and other sounds

The redwing (Turdus iliacus) employs a range of short, situational vocalizations for communication, contrasting with its longer, more melodic song used primarily in territorial defense. The alarm call is a sharp, rattling series such as "chet-chet-chet" or "trrt-trrt-trrt", typically produced when the bird is disturbed or perceives a threat near its nest or foraging area.^[27] These calls alert nearby individuals and may accompany defensive flights toward intruders, as observed during nesting disturbances.^[28] Contact calls are soft and repetitive "seep" notes, often given by individuals in foraging flocks to maintain group cohesion while searching for food on the ground.^[29]^[30]^[31] During flight, particularly in nocturnal migration, the redwing emits high-pitched, drawn-out calls like "tseer", "tseee", or "srieh", which facilitate coordination in loose flocks overhead.^[13]^[32]^[20] A softer nasal variant, described as "kuk", may also occur in flight or foraging contexts.^[33] In mobbing scenarios against predators, the alarm calls intensify and are combined with approach behaviors to harass the threat, though physical contact is rare.^[28]

Distribution and habitat

Geographic range

The redwing (Turdus iliacus) breeds across a broad expanse of the northern Palearctic, from Iceland and the Faroe Islands in the west through Scandinavia, the British Isles (with a small population in northern Scotland), the Baltic region, and northern Russia to western Siberia in the east, generally reaching up to 70°N latitude, extending eastward to the Altai region and lower Kolyma River in Siberia.^[2]^[34]^[35]^[36] This distribution encompasses subarctic and boreal zones, with the nominate subspecies T. i. iliacus predominant across most of the mainland range and T. i. coburni restricted to Iceland and the Faroe Islands.^[37] The species' breeding range has undergone historical expansion following post-glacial recolonization after the Pleistocene ice age, allowing northward spread into newly available habitats as ice sheets retreated.^[38] In recent decades, slight range extensions have occurred in eastern Europe. Wintering distribution shifts southward to milder regions, primarily in southern and western Europe (including the Iberian Peninsula, France, Italy, and the Balkans), northwest Africa (such as Morocco and Algeria), and the Middle East (extending to the Black Sea coasts, Georgia, and northern Iran).^[8]^[39]^[27] Vagrant individuals occasionally appear outside the typical ranges, with records in North America—particularly along the east coast from Newfoundland to the northeastern United States, the west coast including British Columbia, and multiple records in Alaska, including sightings in Seward (2011) and Utqiagvik (2022), as of 2025—where they may briefly overlap with the resident American robin (Turdus migratorius).^[4]^[27]^[14]^[40]^[41] Rarer vagrants have been documented in South Asia, including Pakistan and Afghanistan.^[42]

Habitat preferences and requirements

The redwing (Turdus iliacus) primarily breeds in open woodlands, forest edges, moors, and tundra habitats featuring scattered trees, often within boreal forests dominated by birch, pine, spruce, and juniper interspersed with open country in lowlands and low hills.^[43]^[8] These environments provide a mix of dense cover for nesting and open areas for foraging, supporting the species' requirements for insect-rich understory and berry-producing shrubs.^[3] The bird shows particular adaptations to boreal conditions, thriving in cooler, northern latitudes where coniferous and deciduous trees offer structural diversity.^[42] In winter, redwings shift to more varied low-elevation habitats including open woodlands, orchards, scrubby thickets, farmland, and gardens, where berry-bearing bushes and grassy areas are abundant; during harsh weather, they congregate in coastal regions and dense hedgerows for roosting.^[43]^[2]^[3] These sites allow communal roosting in protective cover, such as thick scrub or hedgerows, to mitigate cold and predation risks.^[44] Nest sites are typically placed in trees or shrubs 2–15 m above the ground, though occasionally in low shrubs or on the ground under dense vegetative cover to shield eggs and fledglings from predators and weather.^[19]^[45]^[2] The species occupies elevations from sea level to 700 m, with rare occurrences up to 2,100 m, reflecting its affinity for accessible boreal and subarctic terrains.^[42] Habitat fragmentation, driven by clear-cutting and agricultural expansion, reduces suitable breeding sites by disrupting forest mosaics and understory density, leading to a 61% decline in redwing densities in affected southern boreal forests in Finland between 1993 and 2022.^[46] Studies from the 2020s highlight climate-driven shifts, including warming temperatures and altered vegetation, that are pushing the species' latitudinal breeding center northward while fragmenting remaining habitats and increasing vulnerability to extreme weather.^[42]^[46]

Behavior

Breeding and reproduction

The redwing breeds primarily in northern and eastern Europe, including Scandinavia and Iceland, with the season typically spanning April to June in these ranges, allowing for 1–2 broods per year.^[2]^[6]^[47] Nest construction is undertaken almost exclusively by the female, who builds a compact, cup-shaped structure from interwoven grass, moss, twigs, and lichen, often bound with mud and lined with fine grass or leaves; the nest is usually positioned low to the ground in dense vegetation, shrubs, or against tree trunks, at heights of 0.1–2 m.^[6]^[35]^[5] The clutch comprises 4–6 eggs, which are pale greenish-blue with fine brown or black spots and blotches concentrated toward the larger end; egg-laying occurs over 1–4 days, with the female incubating the clutch alone for 10–14 days until hatching.^[2]^[6]^[48]^[5] The altricial nestlings, covered in sparse down, remain in the nest for 12–15 days before fledging; both parents feed the young during this period and continue providing care for approximately 2 additional weeks post-fledging, after which the female may initiate a second brood while the male tends the first.^[2]^[6]^[5] Redwings are socially monogamous, with pair bonds forming through male song displays that attract females and help establish breeding territories; the male's singing rate peaks during mate attraction and declines after egg-laying begins.^[28]^[24]

Foraging and diet

The redwing (Turdus iliacus) exhibits an omnivorous diet that shifts seasonally to meet nutritional demands. During the breeding season in spring and summer, invertebrates predominate, with earthworms forming a major component alongside insects, larvae, snails, and slugs.^[49] In autumn and winter, the diet transitions to include a high proportion of plant matter, particularly berries and fruits such as rowan (Sorbus aucuparia) and hawthorn (Crataegus monogyna), which provide essential energy for migration and survival in colder conditions.^[49] Nestlings receive a diet dominated by earthworms as a high-protein subset of breeding-season foraging.^[49] Foraging occurs primarily on the ground and in low vegetation, employing techniques such as bill-probing into moist soil to extract buried invertebrates like earthworms, gleaning insects from foliage, and surface-pecking for seeds or fallen fruits, often in loose flocks of 10–200 individuals.^[49] The species' slender, slightly decurved bill is adapted for probing and extracting prey from substrates, facilitating access to hidden invertebrates, while acute vision, including sensitivity to ultraviolet reflectance, enhances detection of visually conspicuous fruits like bilberries (Vaccinium myrtillus), as demonstrated in laboratory choice experiments where redwings preferentially selected UV-reflecting berries.^[50] Redwings frequently forage in mixed-species flocks with other thrushes such as fieldfares (Turdus pilaris) and blackbirds (Turdus merula), resulting in interspecific competition for shared invertebrate and fruit resources, particularly in resource-limited winter habitats.^[49] In agricultural landscapes, their consumption of berries and fruits in orchards and hedgerows can lead to localized impacts on soft fruit crops, prompting management considerations in agro-ecosystems to balance bird conservation with crop protection.^[51]

Migration and movements

The redwing (Turdus iliacus) exhibits partial migration, with northern populations from Iceland, Scandinavia, and Russia undertaking long-distance journeys southward, typically covering 2,000–4,000 km to wintering grounds in northwest Africa and southern Europe, while southern European populations remain largely sedentary or make only short movements.^[42]^[52] This latitudinal variation in migratory behavior allows northern birds to escape harsh winters, whereas milder climates enable resident populations in areas like Britain and Ireland to persist year-round.^[2] Post-breeding departure from northern breeding grounds begins as early as late July in eastern Siberia, extending through October across western populations, with arrivals at wintering sites peaking from September to November.^[53] Return migration occurs primarily from March to April, aligning with improving conditions at breeding areas and often involving nocturnal flights to cover distances efficiently.^[19] During these journeys, redwings frequently form large flocks numbering in the thousands, sometimes reaching up to 10,000 individuals, which provides safety from predators and aids in locating food resources en route.^[2] In years of poor berry production in northern regions, irruptive movements intensify, driving flocks farther south or westward beyond typical routes to exploit alternative food sources.^[54] Redwings navigate using a multifaceted system of cues, including celestial orientation from the setting sun and stars, geomagnetic fields for directional sensing, and visual landmarks such as coastlines and rivers for fine-scale adjustments.^[55] Stopover sites, crucial for refueling, are predominantly wetlands and swampy grounds where birds exploit invertebrate and berry resources to build fat reserves for continued flight.^[56] Recent analyses of ringing recoveries from the 2020s, including data from the European-African migration network, reveal route variations influenced by weather, with birds from Fennoscandia occasionally shifting to more westerly paths over the North Atlantic during favorable tailwinds or avoiding stormy fronts by detouring inland.^[56]

Ecology

Predators and natural threats

The redwing faces predation from various avian species, particularly birds of prey that target adults and fledglings during foraging or migration. Sparrowhawks (Accipiter nisus) are a primary threat, ambushing redwings in woodland edges and gardens with high-speed pursuits, often preying on thrushes including this species.^[57] Merlins (Falco columbarius), small falcons, also hunt redwings, especially during autumn migration when flocks are vulnerable, as observed in pursuits where the thrush evades capture through agile flight.^[58] Owls, such as short-eared owls (Asio flammeus), occasionally capture adult redwings, exploiting low-light conditions to surprise them near roosts.^[59] Mammalian predators pose significant risks to nests, which are typically built low in shrubs or trees. Domestic and feral cats (Felis catus) raid nests for eggs and chicks, particularly in suburban areas where redwings breed or overwinter.^[60] Red foxes (Vulpes vulpes) opportunistically prey on ground-level or low nests, digging out or reaching in to consume contents, contributing to high failure rates in open habitats.^[61] Weasels (Mustela nivalis) are agile nest predators, squeezing into tight spaces to devour eggs and nestlings, especially in rural breeding grounds.^[62] Nest predation rates can reach up to 55% in monitored populations, as recorded in Norwegian studies where hooded crows (Corvus cornix) were the most frequent predator, though other corvids and mammals contribute regionally.^[28] Redwings mitigate these risks through nest camouflage, constructing cups from grass, moss, and lichens that blend with surrounding foliage, reducing visibility to visual hunters.^[63] Adults also employ alarm calls—a sharp "seep-seep"—to warn of approaching predators, prompting flock evasion or mobbing.^[28] Beyond predation, abiotic factors like severe weather threaten redwing survival. Harsh winters with prolonged frost and snow lead to starvation by limiting access to berries and invertebrates, causing heavy mortality in overwintering flocks. Storms during migration, including autumn gales across the North Sea, increase disorientation and exhaustion, with collisions and drowning reported in adverse conditions.^[6] Cold, wet summers further reduce breeding success by impairing foraging and chick development.

Parasites, diseases, and interactions

Redwings (Turdus iliacus) are susceptible to several common ecto- and endoparasites, including feather lice (Phthiraptera), ticks (Ixodidae), and intestinal helminths such as tapeworms (Cestoda). Feather lice, such as species in the genera Brueelia and Menacanthus, have been recorded on redwings in Europe, with infestations typically low but contributing to feather damage and irritation during breeding seasons.^[64] Ticks, particularly Ixodes ricinus, frequently infest redwings, with thrushes showing high mean infestation intensities in forested habitats; these ticks can transmit pathogens like Borrelia burgdorferi, exacerbating health risks during migration.^[65] Intestinal worms, including tapeworms like those in the genus Anomotaenia, parasitize the duodenum of redwings, potentially leading to nutrient malabsorption and reduced body condition, as documented in European populations.^[66] Viral diseases also pose significant threats to redwing health. Avian pox, caused by avipoxviruses, affects European songbirds including thrushes, manifesting as cutaneous lesions on unfeathered areas; severe cases reduce survival, particularly in juveniles, by impairing vision and foraging.^[67] West Nile virus (WNV) exposure has been detected in migratory European passerines, with seroprevalences detected in Turdus species in Europe; in naïve populations, WNV can cause mortality rates exceeding 50% through neurological damage and viremia.^[68] Additionally, Sindbis virus antibodies occur at 37% prevalence in Swedish redwings, indicating widespread exposure that may contribute to subclinical infections and reduced fitness.^[69] Redwings engage in mutualistic interactions with plants through frugivory, acting as key seed dispersers for berry-producing species. By consuming fruits of rowan (Sorbus aucuparia) and crowberry (Empetrum nigrum) in Iceland, redwings deposit viable seeds away from parent plants via endozoochory, enhancing plant recruitment in open habitats with dispersal distances averaging 100-500 meters.^[70] This symbiosis benefits plants by promoting genetic diversity and colonization of new areas, while providing redwings with essential energy during pre-migratory fattening. Interspecific competition occurs with congeners like the Eurasian blackbird (Turdus merula), particularly for berry and invertebrate resources in wintering grounds. Redwings exhibit niche segregation by foraging at lower vegetation strata and in more open areas compared to blackbirds, reducing overlap; however, in resource-scarce winters, introduced or expanding thrush populations can displace redwings from optimal feeding sites, impacting overwinter survival.^[71] Recent research highlights the redwing's gut microbiome's role in migration health, with compositional shifts during long-distance flights reducing bacterial diversity but enriching taxa like Lactobacillus that bolster immune function and pathogen resistance. Studies from 2020-2025 on Palearctic migrants show microbiome remodeling influences energy allocation and disease susceptibility, with dysbiosis linked to higher haemosporidian infection rates in fatigued individuals.^[72]

Conservation status

Population trends and threats

The Redwing (Turdus iliacus) is currently classified as Least Concern on the IUCN Red List, following its reassessment in 2025 from Near Threatened, reflecting a global population of approximately 40–70 million mature individuals. In Europe, which hosts the majority of the breeding population, estimates range from 16–28 million mature individuals, based on 8–14 million breeding pairs. Monitoring by BirdLife International indicates an overall stable to increasing trend across Europe, with a 12% rise in breeding numbers from 2012 to 2022.^[42] However, long-term data reveal declines in specific regions, particularly agricultural landscapes, where populations have decreased by up to 25–30% since 1980 due to habitat intensification and loss of suitable foraging areas.^[73] Key anthropogenic threats include intensified agriculture, which reduces invertebrate prey availability critical for breeding adults and nestlings, as well as illegal trapping during migration and winter in Mediterranean countries (e.g., an estimated 50,000–300,000 individuals trapped annually in Italy). Climate change exacerbates these pressures by altering berry production cycles, leading to unpredictable winter food supplies; warmer temperatures and shifting phenology have been associated with reduced rowanberry and holly yields in northern Europe, forcing greater migration distances or starvation risks during harsh winters. Over-grazing in breeding habitats further diminishes ground cover for nesting and foraging.^[42]^[2]^[74] Ongoing monitoring highlights potential range shifts linked to climate warming, with northward expansions in breeding distribution and increased vagrancy records beyond traditional migration routes, such as more frequent sightings in southern Greenland and eastern North America. These shifts may reflect adaptive responses to changing temperatures but also signal vulnerability if food resources fail to synchronize with altered timings. National surveys up to 2025, including those from the British Trust for Ornithology and equivalent programs in Fennoscandia, continue to track these dynamics, emphasizing the need for integrated threat assessments.^[42]^[8]

Conservation measures and efforts

The Redwing (Turdus iliacus) benefits from protection under the EU Birds Directive (Directive 2009/147/EC), which mandates member states to implement measures for the conservation of wild bird populations, including habitat safeguarding and regulation of hunting where applicable.^[75] Sustainable hunting is permitted in eight Mediterranean EU countries under Annex II(b) of the directive, with monitoring required to ensure it does not jeopardize conservation status.^[42] Additionally, the species is covered by the Bern Convention on the Conservation of European Wildlife and Natural Habitats, which promotes international cooperation for migratory species protection across Europe.^[75] In the European Union, 486 Natura 2000 sites have been designated at least partly for the Redwing, primarily in Mediterranean countries where it occurs during migration and winter, providing critical stopover and foraging habitats.^[42] National parks and protected areas in breeding ranges, such as those in Scandinavia and the UK, further support populations by preserving forested and woodland environments essential for nesting.^[2] In the UK, the Redwing is protected under the Wildlife and Countryside Act 1981, prohibiting intentional disturbance or harm.^[76] Agricultural practices play a key role in conservation, particularly through hedgerow preservation, which maintains berry sources like hawthorn and holly vital for winter foraging flocks.^[6] Agri-environment schemes, including organic farming initiatives, enhance invertebrate prey availability in grasslands, supporting breeding success in fragmented rural landscapes. Habitat restoration projects focus on reconnecting hedgerows and restoring lowland neutral grasslands to mitigate fragmentation, thereby improving connectivity for migratory movements.^[77] Research and monitoring efforts rely heavily on citizen science programs, such as the British Trust for Ornithology's (BTO) Garden BirdWatch and Constant Effort Sites scheme, which track annual population fluctuations and breeding productivity.^[2] Globally, eBird facilitates real-time data collection from observers, enabling analysis of migration patterns and winter distributions to inform targeted interventions.^[13] These initiatives have contributed to recent assessments, including the IUCN's 2025 reassessment classifying the Redwing as Least Concern following evidence of stable or recovering trends in key regions.^[78]

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Jun 9, 2019 · The song audio 3 , issued by the male from a prominent high perch, is a series of simple and rather monotonous phrases (less developed than T.
[20]
Song Conformity and Continuity in Song Dialects of Redwings ...
Aug 6, 2025 · Recorded and analysed the song patterns of 304 redwing males during consecutive years in 6 populations in C Norway and Sweden.
[21]
Song conformity and continuity in song dialects of Redwings - jstor
Continuity and change in dialect structure of Redwing Turdus iliacus. ... morphology of the song of the Redwing Turdus iliacus. -. Fauna norv. Ser. C ...
[22]
Changes in structure of Redwing's (Turdus iliacus) local dialect in time
May 1, 2008 · The major changes occurred to the first element of song ... Acoustic analysis of Taylor Swift's dialect changes across different eras of her ...
[23]
Singing Activity and Song Pattern of the Redwing Turdus iliacus ...
Function of song was studied by recording changes in singing rate and song structure throughout the breeding season.
[24]
The response of male Redwings Turdus iliacus to playback of - jstor
The song of male Redwings can be divided into two parts, an introductory section and a terminating section (twitter). A previous study found that the ...
[25]
Do flight-calls of Redwings differ during nocturnal and diurnal ...
Aug 23, 2025 · ... Turdus iliacus. These were issued during diurnal and nocturnal ... frequency is in the intermediate and high frequency range from 5.1 to 9.9 kHz.
[26]
[PDF] On the significance of song amplitude in birds – function ...
(2010) examined the responses of redwing males Turdus iliacus to variation of sound amplitude in twitter song, a particular type of song that is used in short-.
[27]
Habitat structure and the evolution of bird song: a meta‐analysis of ...
Oct 24, 2006 · Habitat structure has been considered as a main factor shaping the evolution of bird song acoustics. 2. Based on expected differential ...
[28]
Redwing / Turdus iliacus | BC Rare Bird Records
The second recognized subspecies of Redwing is called (Turdus iliacus coburni) (Clements 2000). It breeds in Iceland and the Faeroe Islands, and winters in ...
[29]
Behavior - Redwing - Turdus iliacus - Birds of the World
May 31, 2024 · Hybridization · Fossils · Distribution · Historical Changes to the ... Recommended Citation. Nagy, J. and P. Pyle (2024). Redwing (Turdus iliacus) ...
[30]
Red(wing) Sky at Night - BirdWatch Ireland
Oct 25, 2019 · Redwings migrate at night, travelling in loose flocks and making a short and soft 'seep' contact call to each other as they fly.
[31]
Winter Thrushes - Belfast Local Group - RSPB
Aug 21, 2022 · A Redwing, a winter thrush with dark brown above and white below, with a black-streaked breast and orangey-red flanks and underwing, sitting on a branch of a ...
[32]
Wild Wednesday - Redwing | Latest news - Arun District Council
Nov 6, 2024 · They have a soft, melodious call that sounds like "seep," which can often be heard during their foraging. Read more here:Redwing | The ...
[33]
Get To Know Your Thrush Songs and Calls | Carbon Rewild
Dec 6, 2024 · Redwing – Turdus iliacus. A winter visitor to most of the UK, the Redwing's call is predominantly a flight call. It has a long 'tseee' call ...Eurasian Blackbird -- Turdus... · Song Thrush -- Turdus... · Mistle Thrush -- Turdus...Missing: mobbing | Show results with:mobbing
[34]
Redwing Turdus iliacus - nocmig
Flight period. A small pulse of migration in early spring (March to April) with a much larger pulse in autumn, from early October to the end of November, though ...Missing: wing morphology
[35]
Redwing (Turdus iliacus) - Planet of Birds
Jun 8, 2011 · Breeds in upper and upper middle latitudes of west Palarctic, mainly in subarctic and arctic lowlands and uplands, but avoiding snow and ice, ...
[36]
Redwing - Turdus iliacus - Species Information and Photos
Length: 8.25 inches, Wingspan: 13.75 inches, Seasonality: Non-resident in South Dakota ; ID Keys: Dark brownish-gray upperparts, white underparts with dark spots ...Missing: leg foot
[37]
Redwing - Turdus iliacus - Observation.org
Redwing · subspecies · Icelandic Redwing - Turdus iliacus coburni · Redwing ssp iliacus - Turdus iliacus iliacus.
[38]
Redwing (Turdus iliacus) | Request PDF - ResearchGate
The Redwing is a relatively small species of the genus Turdus, which is widely distributed throughout the northern Palearctic region.
[39]
Migration routes, breeding areas and between‐winter recurrence of ...
Aug 7, 2025 · The populations of Redwings T. iliacus are obligate or partial migrants and overwinter in a wide area from Iceland to the Black Sea (Huttunen ...Missing: wing morphology
[40]
Redwing Turdus Iliacus Species Factsheet | BirdLife DataZone
This species has a large geographic range size and a very large, estimated population size (>40 million mature individuals). Its population has fluctuated ...Missing: 1758 | Show results with:1758
[41]
Habitat - Redwing - Turdus iliacus - Birds of the World
May 31, 2024 · The Redwing breeds in a mosaic of forest (including birch, pines, spruces, and juniper) and open country in the lowlands and relatively low hills.Missing: wintering altitude
[42]
https://datazone.birdlife.org/species/factsheet/redwing-turdus-iliacus
[43]
The Redwings (Turdus iliacus) - Earth Life
Jul 12, 2023 · The English name derives from the bird's red underwing. It is not closely related to the Red-winged Blackbird, a North American species ...
[44]
Clear-cuts and warming summers caused forest bird populations to ...
Of the short-distance migrants, the density of the chaffinch Fringilla coelebs declined by 28%, the redwing Turdus iliacus by 61%, the song thrush Turdus ...
[45]
Redwing - Bird Factfile | Vine House Farm
A member of the thrush family, the Redwing is a highly attractive bird with a speckled breast much like that of the Song Thrush, a distinct cream stripe above ...Missing: origin | Show results with:origin
[46]
Breeding - Redwing - Turdus iliacus - Birds of the World
May 31, 2024 · Egg laying begins on the same day that the nest is completed or after that; clutches are completed within 1–4 days; the incubation period is usually 12 days.
[47]
Spot the Icelandic Redwing | Birding in Iceland - Perlan Museum
The Redwing is a passerine (Passeriformes) belonging to the Turdidae family found in Europe, Asia, and the Pacific. It is a rather small, delicate bird that ...
[48]
Diet and Foraging - Redwing - Turdus iliacus - Birds of the World
May 31, 2024 · Plumages, Molts, and Structure · Plumages · Molts · Bare Parts ... Redwing (Turdus iliacus), version 2.0. In Birds of the World (G. M. ...Diet · Major Food Items · Food Selection And Storage<|control11|><|separator|>
[49]
Ultraviolet reflection of berries attracts foraging birds. A laboratory ...
We conducted an experiment to test how the UV reflection of berries affects birds' foraging. Redwings were allowed to choose between UV–reflecting bilberries ...
[50]
Preserving frugivorous birds in agro‐ecosystems: lessons from ...
Nov 12, 2010 · (2008b) Countryside elements and the conservation of birds in agricultural ... (1988) Alimentación del Zorzal alirrojo (Turdus iliacus) durante su ...
[51]
[PDF] Huntable bird species under the Birds Directive
Redwing Turdus iliacus ... Movements: Partial migrant. In Britain and. Ireland most birds are sedentary, but in continental Europe the species undergoes.
[52]
Movements and Migration - Redwing - Turdus iliacus
May 31, 2024 · The subspecies coburni largely vacates Iceland and the Faeroes in winter, passing through Fair Isle (off northern Scotland) slightly later ...
[53]
Scotland's winter visitors: why and how do they migrate? - BTO
Nov 22, 2022 · Poor berry crops in Fennoscandia, for example, push species such as Redwing across to the UK in search of food. The biggest 'pull' factor for ...
[54]
Magnetic and sunset orientation in migratory redwings, Turdus iliacus
Apr 1, 2009 · Redwings showed a mean orientation towards the SW in control clear sky tests, which is an appropriate autumn migratory direction for the season.
[55]
Bird Migration Atlas
From Iceland birds move NW - SE to Ireland, UK, W Europe and Iberia. From the UK movements are predominantly N – S to SW France. A minority moves more westerly ...Missing: patterns | Show results with:patterns
[56]
Sparrowhawk - Scottish Raptor Study Group |
In Speyside and the south of Scotland pairs provision their young primarily with Chaffinch, Meadow pipit, Robin, Blackbird and Song thrush while migrant Redwing ...
[57]
Redwing 1 Merlin 0 | Isle of May National Nature Reserve
Oct 14, 2024 · Today one of our Merlin's was in full pursuit of its prey; a freshly arrived Redwing. However the Thrush wasn't giving up its life that easily ...
[58]
Short-Eared Owl | ORNOSK – birds, landscape, weather
This Short-Eared Owl just caught an adult Redwing, – such a big prey. You ... The owls mostly eat mice. – It is always a treat to see an owl ...
[59]
Redwing Diet and Size: Feeding Habits, Predators ... - Binocular Base
Among the most common threats to Redwings are hawks and owls, which may target both adult birds and their young. The risk of predation is especially high during ...The Dietary Habits Of The... · Breeding Habits Of RedwingsMissing: rate | Show results with:rate
[60]
Red Foxes Interaction with Other Species - Gamebirds & Waders
Middleton found that foxes were the most significant predator of the birds and their nests, but he also observed that almost as many nests were destroyed by ...
[61]
Pop Goes the Weasel - Marcia Bonta
Apr 1, 2021 · Long-tailed weasels also eat deer, beaver, and woodchuck carrion, insects, earthworms, and any birds they can catch on nests. Red-winged ...
[62]
The Redwing Invader - Cage & Aviary Birds
In Iceland, where trees are scarce, redwings frequent lower scrub vegetation and often nest close to the ground well camouflaged. Still, as with most thrushes, ...
[63]
Redwing - Wikipedia
The redwing (Turdus iliacus) is a bird in the thrush family, Turdidae, native to Europe and the Palearctic, slightly smaller than the related song thrush.
[64]
[PDF] Chewing lice (Phthiraptera: Amblycera, Ischnocera) species found ...
Redwing (Turdus iliacus), and Tawny Owl (Strix aluco) were examined for lice for the first time in Turkey in this study. The Eurasian Woodcock had 2 louse ...
[65]
Forest Bird Hosts of Ixodes ricinus Tick & Borrelia burgdorferi
Thrushes (Turdus iliacus, T. merula and T. philomelos) were trapped most often and had the highest mean infestation intensity for both Ixodes ricinus and I.
[66]
Tapeworm Species Details - Global Cestode Database
Turdus. Species, pilaris. Subspecies. Additional Host(s), Turdus iliacus. Site in Host, duodenum. Host Notes. Type Locality. Country, Europe. Body of Water.
[67]
Avian Pox in Garden Birds
Birds with avian pox develop warty or tumour-like growths, on the head (particularly next to the eye or beak), legs, wings, or other body parts.
[68]
Evidence of exposure to West Nile virus and Usutu virus in migratory ...
The increased prevalence of WNV and USUV in birds and mosquitoes in Europe, possibly due to a warmer climate, also poses a risk to human health. Indeed, a ...
[69]
[PDF] Bird-Parasite Interactions - DiVA portal
Higher than average antibody prevalences were found in three thrush species, the fieldfare. (Turdus pilaris) (43.3%), the redwing (Turdus iliacus) (37.0%), and ...
[70]
Frugivory and seed dispersal by redwings Turdus iliacus in ...
Aug 6, 2025 · We studied consumption of wild fruits by redwings (Turdus iliacus) at two sites in the SW coast of Iceland, just prior to their autumn ...
[71]
(PDF) Niche segregation between two sympatric thrush species, the ...
Oct 15, 2025 · The fundamentals for niche segregation suggest that species must exploit their resources differently to coexist. This can be accomplished ...
[72]
Migratory microbiomes: the role of the gut microbiome in bird ...
Mar 31, 2025 · We find that active migration is usually associated with reduced diversity of the gut microbiome and with the expansion of several study-specific taxa.Missing: redwing | Show results with:redwing
[73]
https://pecbms.info/trends-and-indicators/species-trends/
[74]
REDWING (Turdis iliacus) - songbird factfile
The redwing, named after its red underwing, is our smallest thrush species. Another winter-visiting thrush, they arrive in late September and stay until April.
[75]
Redwing - Turdus iliacus - Linnaeus, 1766 - EUNIS - European Union
Turdus iliacus with the common name Redwing, belongs to the Birds group it is geographically distrubuted among the following countries/areas: Azerbaijan, ...Missing: 1758 | Show results with:1758
[76]
Redwing | The Wildlife Trusts
The redwing is a small thrush that visits the UK in the winter to feast on berry-laden bushes in hedgerows, orchards, parks and gardens. Redwings migrate ...
[77]
The management of lowland neutral grasslands in Britain: effects of ...
Dec 21, 2001 · The most important direct effects have been deterioration of the sward as nesting and wintering habitat, and loss of seed resources as food.Grassland Management... · Use Of Fertilizer On... · Livestock Stocking Practices<|separator|>
[78]
IUCN World Conservation Congress sets New Vision - FACE
Oct 26, 2025 · ... status, although FACE was pleased to see the Redwing (Turdus iliacus) reassessed as Least Concern (previously it was Near Threatened).