The Redwing (Turdus iliacus) is a small migratory bird belonging to the thrush family, Turdidae. Recognized for its distinctive white eyebrow stripe and striking red flanks, the Redwing is a familiar sight across northern Europe and Asia during the breeding season and in milder regions of Europe in winter. Despite its common name, it is not closely related to the North American Red-winged Blackbird (Agelaius phoeniceus), which belongs to the entirely different family Icteridae. Instead, the Redwing shares many characteristics with other thrushes, including ground feeding habits and melodious song. This article explores key aspects of the Redwing’s biology, ecology, and conservation, providing a comprehensive overview for birdwatchers, nature enthusiasts, and students alike.
Scientific Classification
The Redwing is classified within the order Passeriformes, commonly known as perching birds or songbirds. Its family, Turdidae, encompasses true thrushes, a group known for their often complex vocalizations and diverse diets. The scientific name of the Redwing is Turdus iliacus, with the genus Turdus including many other familiar thrushes such as the Song Thrush (Turdus philomelos) and the Fieldfare (Turdus pilaris).
The species was first described by Carl Linnaeus in 1758. The genus name Turdus is Latin for “thrush,” while the species name iliacus refers to the bird’s habitat near the iliac region (associated with northern geographic areas). Although closely related to other European thrush species, the Redwing stands out due to its migratory behavior and distinctive plumage features, such as the bright reddish-orange flank patches that give the bird its name.
Geographic Range & Distribution
The Redwing is a widespread species breeding primarily across northern Europe and Asia. Its breeding range extends from Iceland and the northernmost parts of Scotland southward through Scandinavia, including Norway, Sweden, and Finland. It also breeds in the Baltic States, northern Poland, Belarus, and across much of Russia, reaching as far east as the Chukotka Autonomous Okrug near the Bering Strait (approximately 165°E longitude). This extensive range covers a variety of habitats, including coniferous and mixed forests, woodland edges, tundra, and birch scrub.
In recent decades, the Redwing has slightly expanded its breeding distribution. Notably, it has established breeding populations in southern Greenland around the Qaqortoq area, first colonized in the early 1990s. It has also extended its breeding range southward into northern Ukraine and parts of eastern Europe. In higher altitude regions, such as mountainous areas of central Europe, the Redwing is often replaced by the closely related Ring Ouzel (Turdus torquatus), which favors more rugged terrain.
As a migratory species, the Redwing undertakes impressive seasonal journeys. After breeding, it migrates southwest to winter in western, central, and southern Europe, including countries like the United Kingdom, France, Spain, and Portugal. Some birds also winter in northwest Africa, particularly Morocco, and parts of southwest Asia as far east as northern Iran. Birds breeding in the eastern parts of the range may travel over 6,500 to 7,000 kilometers to reach their wintering grounds.
While most Redwings migrate, some populations, especially those in southwestern Norway and adjacent areas, may remain resident year-round if local conditions are mild enough. Migrating and wintering Redwings often form loose flocks ranging from ten to several hundred individuals. These flocks frequently mix with other thrush species such as Fieldfares (Turdus pilaris), Common Blackbirds (Turdus merula), Starlings (Sturnus vulgaris), and sometimes Mistle Thrushes (Turdus viscivorus) and Song Thrushes (Turdus philomelos).
Physical Description
The Redwing is a small thrush, measuring approximately 20 to 24 centimeters in length with a wingspan ranging from 33 to 34.5 centimeters. It typically weighs between 50 and 75 grams, making it slightly smaller than the closely related Song Thrush. The bird’s overall shape is compact with relatively short wings and tail, adapted for agile flight during long migrations.
The plumage of the Redwing is distinctive and easily recognizable. The upperparts display a warm brown color, mottled with darker streaks, while the underparts are cream or off-white with bold dark streaks along the chest and flanks. The most striking feature is the bright orange-red patch on each flank, visible when the bird is in flight or perched. Another key identification mark is the prominent creamy-white supercilium (eyebrow stripe) that contrasts sharply with the darker head and eye stripe.
The bill is relatively short and slender, with a yellowish base and darker tip, well suited to its omnivorous diet. During the winter months, plumage may appear slightly duller, but the red flanks and white eyebrow remain clear identifiers. Juvenile Redwings resemble adults but have a more spotted breast and less vivid flank coloration.
Behavior & Diet
Redwings are known for their nomadic and gregarious behavior, particularly outside the breeding season. During migration and winter, they often gather in large flocks that can number in the hundreds. These flocks forage together, moving through fields, hedgerows, and woodland edges in search of food. Redwings are primarily ground feeders, exhibiting a characteristic hopping and running motion as they search leaf litter.
Their diet is varied and changes seasonally. During the breeding season, Redwings consume mostly invertebrates such as earthworms, insects, and spiders, which provide the protein necessary for feeding nestlings. They are adept at probing soil and leaf litter to uncover hidden prey. In autumn and winter, their diet shifts to include a significant proportion of berries and fruits, especially those of hawthorn, rowan, holly, and elderberry. This frugivorous diet is essential for building fat reserves to sustain them through cold months.
Redwings have also been observed feeding on grain and seeds, particularly when natural food sources are scarce. Their flexible diet helps them adapt to fluctuating environmental conditions. Vocalizations play a key role in their social behavior. Their song is a high-pitched, melodic series of whistles and trills, often delivered from a high perch. During migration and winter, their calls include a sharp “seep” or “tseep” sound, which helps maintain flock cohesion. According to RSPB, this species is well documented.
Breeding & Reproduction
Redwings breed in a variety of northern habitats dominated by conifer and birch forests, mixed woodland, and tundra landscapes. They prefer areas with dense undergrowth or shrubs that provide cover for nesting sites. While they typically nest in low shrubs, they also occasionally build nests on or near the ground, especially in moorland or heath environments. According to Cornell Lab of Ornithology, this species is well documented.
The nest is a neat cup-shaped structure constructed from grasses, mosses, and leaves, often lined with mud for stability. Female Redwings lay between four and six eggs per clutch. The eggs measure approximately 2.6 by 1.9 centimeters and weigh about 4.6 grams, with roughly 5% of the weight accounted for by the eggshell. The coloration of the eggs varies but is generally pale with reddish or brown speckles.
Incubation lasts around 12 to 13 days and is primarily the responsibility of the female. Once hatched, the chicks are altricial—born blind and helpless—and remain in the nest for 12 to 15 days before fledging. Despite fledging, young Redwings continue to depend on parental care and feeding for an additional two weeks. During the breeding season, adults are highly territorial and engage in vocal displays to defend nesting sites from rivals.
Breeding success can be heavily influenced by weather conditions. Cold, wet summers tend to reduce insect availability, leading to lower chick survival. Severe winters may also cause high mortality rates among adult birds and juveniles, impacting population numbers temporarily.
Conservation Status
The Redwing is currently classified as Least Concern by the International Union for Conservation of Nature (IUCN). Its extensive geographic range, estimated at approximately 10 million square kilometers (3.8 million square miles), and large population size—estimated between 31 and 42 million individuals in Europe alone—contribute to its relatively secure conservation status.
While the overall population is stable, local fluctuations can occur due to environmental factors. Severe winters with heavy snowfall and prolonged cold can cause significant mortality, particularly in young or weak individuals. Similarly, cold and wet breeding seasons may reduce reproductive success. Habitat loss and fragmentation are less significant threats compared to other bird species, as Redwings utilize a broad range of habitats across their vast range.
Conservation efforts focus on monitoring population trends and protecting important breeding and wintering habitats. The species benefits from general woodland conservation and agricultural practices that maintain hedgerows and berry-producing shrubs. In some parts of its range, particularly in central and southern Europe, Redwings are considered indicators of healthy ecosystems due to their sensitivity to habitat changes and food availability.
Interesting Facts
The Redwing’s name derives from the bright reddish-orange patches on its flanks, which are visible as flashes of color during flight. This feature distinguishes it from other thrushes and aids birdwatchers in identification. The Redwing is also sometimes called the “Little Redwing” to differentiate it from the larger Fieldfare, which shares much of its range and behaviors.
One remarkable aspect of the Redwing is its extensive migratory journey. Birds from eastern Russia undertake one of the longest migrations of any European thrush, traveling thousands of kilometers to reach wintering grounds in western Europe and the Middle East. This endurance highlights the species’ adaptability and navigational skills.
In folklore and traditional culture, Redwings have been noted for their arrival signaling the onset of winter in northern Europe. Their flocks feeding on berries in gardens and orchards are often seen as a sign of seasonal change. Additionally, their melodious song is a cherished sound of the northern forests during the breeding season, contributing to the natural soundscape.
From a scientific perspective, Redwings have been subjects in studies examining migration patterns, diet flexibility, and the impacts of climate change on bird populations. Their ability to adjust migratory timings and routes in response to changing conditions provides valuable insights into avian ecology and conservation challenges.
In summary, the Redwing (Turdus iliacus) is a fascinating and resilient thrush species with a wide distribution, striking appearance, and important ecological role. Its seasonal movements and adaptable behavior make it a captivating subject for anyone interested in birdwatching or studying migratory birds. By understanding and appreciating such species, we gain deeper insight into the complex interconnections within natural ecosystems.
