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White-tailed Hawk

From Opus

Pale morphPhoto by HelenBNear the Attwater Prairie Chicken NWR, SE Texas, August 2004
Pale morph
Photo by HelenB
Near the Attwater Prairie Chicken NWR, SE Texas, August 2004
Geranoaetus albicaudatus

Contents

[edit] Identification

44–60 cm (17¼-23½ in)
A bulky hawk with a short white tail with a black sub-terminal band.

The common pale morph has white underparts and rump, dark gray back and rusty-colored shoulder patches. The rarer dark morph is, except for the tail, almost entirely brownish-black.

Juveniles are mainly blackish with variable whitish markings on the underparts and head.

[edit] Distribution

South-eastern Texas, through Central America, and most of South America east of the Andes as far south as central Argentina. It is absent from densely forested regions (e.g. most of the Amazon).

Pale morphPhoto by Peacefrog2Needville, SE Texas, February 2005
Pale morph
Photo by Peacefrog2
Needville, SE Texas, February 2005

[edit] Taxonomy

Formerly placed in the genus Buteo.

[edit] Subspecies

Three subspecies are recognized1:

  • G. a. hypospodius:
  • G. a. colonus:
  • G. a. albicaudatus:

Avibase2 mentions one additional subspecies sennetti?

[edit] Habitat

Open or semi-open habitats, grasslands.

Pale morphPhoto by DecaGonçalves, MG, Brazil, September 2004
Pale morph
Photo by Deca
Gonçalves, MG, Brazil, September 2004

[edit] Behaviour

The White-tailed Hawk in active flight has slower wing beats that most other North American Buteos. When soaring and to some extent when gliding, wings are held above horizontal. This species is also able to "kite", i.e., staying airborne against the wind without flapping.

Seems to spend a lot of time keeping its feathers in good shape (preening).

[edit] Diet

It feeds on insects, reptiles, mammals, amphibians or even smaller birds. Some of its prey might be caught while the bird is walking on the ground. Can be seen near roads, where, like the Southern Caracara (Caracara plancus), it waits for road-killed prey.

[edit] Vocalisation

The primary calls of adult birds are best described as alarm calls, given if an intruder is noticed within territory or approaching the nest. The two sexes give slightly different versions of this call, described as "aaaa, ke-HAK, ke-HAK, ke-HAK" for males and "aaaa, KUT-uh, KUT-uh, KUT-uh" for females. This call can also be given outside breeding season, indicating that territories might be defended year round.

JuvenilePhoto by onlybillBrazoria NWR, Texas, August 2008
Juvenile
Photo by onlybill
Brazoria NWR, Texas, August 2008

[edit] Breeding

In North America during the first months of the year, with territoriality starting before new year, but timing obviously differ in different parts of its large range. Nest is placed in top of a bush or large cactus, only a few meters above ground, frequently in relatively open areas within the territory. Nesting often results in two hatchlings, hatched asynchronously. In years with poor food availability, the older hatchling is more likely to survive. One brood per year, but if first set of eggs lost, may re-nest.

[edit] References

  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017, with updates to August 2017. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. Avibase
  3. Birds of North America online

[edit] External Links


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