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44â€“60 cm (17Â¼-23Â½ in)
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.
Formerly placed in the genus Buteo.
Three subspecies are recognized1:
Avibase2 mentions one additional subspecies sennetti?
Open or semi-open habitats, grasslands.
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).
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.
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.
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.
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