figure, drawing, illustration of Variable Hawk (Geranoaetus polyosoma) Formerly placed in Buteo and thought, mistakenly, to be close to Buteo galapagoensis. Red-backed Hawk (Geranoaetus polyosoma) [version 1] Avibase taxonomic concepts v. 01 (August ): Red-backed Hawk (Buteo polyosoma) [version 1]. Red-backed Hawk (Buteo polyosoma) English Wikipedia has an article on: Proper noun[edit]. Buteo polyosoma m. A taxonomic species within the family.

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Buteo polyosoma, Buteo polyosoma Red-backedButeo polyosoma polyosoma, Falco polyosoma, Geranoaetus polyosoma, Geranoaetus polyosoma Red-backed Lithuanian: Roodrugbuizerd, Roodrugbuizerd rode rug Norwegian: Translate Avibase is also available in the following languages: Re-split Buteo poecilochrous from B. Subspecies and Distribution G.

Adults of all have a white tail with a contrasting black subterminal band and grey wings barred dark in flight from below, the remiges appear whitish with fine barring and a broad black tip. Most recent authorities have supported the lumping together of the two hawks although the issue still is controversial. True to its English name, a highly variable, polymorphic hawk with longish wings and legs and medium-length tail Its taxonomy is disputed, with some splitting it into the widespread red-backed hawk G.

It is widespread and often common in open habitats in western and southern South America, including the Falkland Islands. Variable hawks occupy open habitats at all elevations. Contribute to Avibase Acknowledgements Flickr group Media stats Flickr group members Media wanted Translate Avibase is also available in the following languages: Bibliography Only subscribers are able to see the bibliography.


Status and conservation Not globally threatened Least Concern. Handbook of the Birds of the World Alive.

Variable Hawk (Geranoaetus polyosoma) | HBW Alive

Buteo poecilochrous GurneyButeo polyosoma. Variable Hawks occupy open habitats at all elevations, where they prey on buyeo and other small animals spotted from the air.

The name variable hawk is fully deserved, as both sexes occur in several morphs. From Wikipedia, the free encyclopedia.

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The larger-bodied, high-elevation hawks take longer to incubate and much longer to fledge than lower elevation hawks. Grey-backed hawk Guteo hawk Mantled hawk. The incubation period is 26 to 36 days.

Females usually have a reddish-brown back, which males usually lack, although at least some males also have this. Breeding is at various seasons and may be variable for all races.

Buteo polyosoma

Only subscribers are able to see the bibliography. Your sightings No sightings Add to a lifelist: The red-backed race inhabits the widest range of areas of the variable hawk races, including above tree line in mountains, Pacific coastal foothills, Patagonian steppesagricultural areas and edges of river galleries, beech woods and humid premontane and lowland forests.

There’s a role for everyone! Long-standing problem of status of form poecilochrousbiteo treated as a full species e. The variable hawk hunts with prey being spotted while soaring from the air and pinned on the ground. Race exsul may be approaching species status, and recently treated as species on grounds of long isolation and lack of sexual dimorphism Rbut very low genetic divergence R argues against such treatment.

White-browed hawk White-necked hawk Black-faced hawk Plumbeous hawk Barred hawk Slate-colored hawk Semiplumbeous hawk. There are many ways to contribute—we need species information, photographs, audio, video, translations, maps, distribution data, and bird sightings.


Show Details Hide Details. Pale morphs are whitish below and gray above; polgosoma this morph, females also have a red back.

Skip to main content. All populations of Variable Hawk are patterned in some combination of white, gray, and chestnut.

Descriptive notes 45—62 cm; — g; wingspan — cm. Variable hawk Female in the Falkland Islands. Though often the most likely race to be found in lowlands, even the red-backed is less than common below an elevation of m up to 3, m. Dark morphs are darker gray overall, and females have chestnut extending onto the poyosoma.

The Variable Hawk is well-named, exhibiting perhaps the greatest variety of plumage patterns of any species of hawk.

Amerikaanse Roodrugbuizerd | Buteo Polyosoma | Variable ha… | Flickr

Avibase checklists Search Avibase search Nuteo by families Contribute There are a few ways by which you can help the development of this page, such as joining the Flickr group for photos or providing translations of the site in addition languages. What do coloured bullet points mean? Aguilucho Variable Spanish Paraguay: The variable hawk Geranoaetus polyosoma is a polymorphic species of bird of prey in the family Accipitridae. Food and feeding Pklyosoma race a generalist mammal predator, taking most prey roughly in proportion to its relative abundance; e.

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