From Opus

Photo by lior kislev
Puno to Cusco road, Peru, December 2009

Alternative name: Red-backed Hawk

Buteo polyosoma

Includes Puna Hawk

[edit] 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
  

Puna Hawk
Photo by tf1044x in Peru

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.

The wings fall short of the tip of the tail on the sitting bird in the "Red-backed" form while the "Puna" form (formerly a separate species) has wingtips that reach the tip of the tail; this seems to be the best separator of the two forms.

Juvenile
Photo by zweiblumen
Cape Pembroke, Falkland Islands, April 2004

[edit] Distribution

South America: found in Colombia, Ecuador, Peru, Bolivia, Chile, Argentina, and Falkland Islands;vagrant to Uruguay, Brazil.

[edit] Taxonomy

It has been proposed to move this species to genus Geranoaetus

[edit] 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 one, Variable Hawk.

[edit] 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, the form Red-backed Hawk is normally seen at lower elevation.

[edit] Behaviour

[edit] Diet

Photo by BirdsPeru
High Andes, Lima, Peru, November 2006

Eats primarily mammals but with a significant amount of insects and some birds.

[edit] 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.

[edit] References

1. 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
2. Avibase
3. BF Member observations
4. Restall et al. 2006. Birds of Northern South America. Yale University Press. ISBN 9780300124156
5. Birdforum thread mentioning several taxonomic proposals, of which 460 is relevant here

• List of references

[edit] External Links