- Buteo polyosoma
Identification
Male: 18 - 20 in. Female: 20 - 22 in.
- White tail with black sub-terminal band but otherwise very variable in plumage
- Lacks black commas or larger black marks seen on wing underside at the wrist of most similar species
Male
- Grey back (mantle can be reddish on some individuals)
- White or dark grey underparts
Female: usually have a rufous mantle but may have either white or rufous or rufous-and-black underparts.
Similar species
The best separator from Puna Hawk is that the wings fall short of the tip of the tail on the sitting bird, Puna Hawk has wingtips that reach the tip of the tail.
Distribution
South America: found in Colombia, Ecuador, Peru, Bolivia, Chile, Argentina, and Falkland Islands;vagrant to Uruguay, Brazil.
Taxonomy
Subspecies[1]
Two subspecies are recognized:
- B. p. polyosoma - Andes of southern Colombia south to Tierra del Fuego, and Falkland Islands
- B. p. exsul - Juan Fernadez Islands, Chile
There is an active debate as to whether Red-backed Hawk and Puna Hawk are two species or one. Opus follows a consensus according to which it is two, but for example the South American Classification Committee has a majority for treating them as one.
Habitat
Open areas to open forest, but most likely in areas with scrub and some trees in steep terrain. Observed at heights up to around 3000 meters in the north of its range, lower down further south. Where overlapping with Puna Hawk, Red-backed Hawk is normally seen at lower elevation than its close relative.
Behaviour
Diet
Most of the food consists of mammals.
Breeding
It nests in treetops. The nest is large and made of dry sticks. The clutch generally consists of 2 white eggs with light reddish spots.
References
- Clements, JF. 2007. The Clements Checklist of Birds of the World. 6th ed., with updates to October 2007. Ithaca: Cornell Univ. Press. ISBN 978-0801445019
- Avibase
- BF Member observations
- Restall et al. 2006. Birds of Northern South America. Yale University Press. ISBN 9780300124156
Recommended Citation
- BirdForum Opus contributors. (2024) Variable Hawk. In: BirdForum, the forum for wild birds and birding. Retrieved 5 May 2024 from https://www.birdforum.net/opus/Variable_Hawk
