Wednesday, Jul 30, 2014

White Hawks

Birds of Prey ... The Sport of Falconry

White HawkWhite Hawk


White Hawks in flightThe White Hawk (Leucopternis albicollis), a bird of prey breeding in the tropical New World, belongs to the family Accipitridae of the Falconiformes; it is sometimes separated in the Accipitriformes with the other hawks and their relatives. Though it is commonly placed in the subfamily Buteoninae, the validity of this group is doubtful and currently under review.


Distribution

This is a bird of lowland forest and other woodlands. It ranges from southern Mexico through Central and South America to Peru, Bolivia and Brazil. It also breeds on Trinidad.

The White Hawk's range in central South America is the entire Amazon Basin, from the Andes on the west to the Guianas on the Atlantic on the northeast, and to the transition lands to the south.

A widespread species, it is usually not common, but the IUCN considers it not to be globally threatened due to the large extent of its range .


White HawkDescription

The adult White Hawk ranges from 46-56 cm long with very broad wings and has a white head, body and underwings. The upper wings are black, and the very short tail is black with a broad white band. The bill is black and the legs are yellow.

Males and females look alike, but females are larger and heavier (840 g compared to the male's 650 g).

Immature birds have extensive black spotting on the upperparts and dark-streaked whitish underparts.

This species is often seen soaring, and has a spectacular aerial courtship display.


Subspecies

There are four subspecies:

  • Leucopternis albicollis ghiesbreghti – Southern Mexico to Nicaragua
Entirely white, except for black markings on the outer primaries, and a black sub-terminal tail bar. The eyes are yellow.
  • Leucopternis albicollis costaricensis – Honduras to Panama and Colombia.
Similar to ghiesbreghti but with more distinct black markings on the wings and tail. The eyes are brown.
  • Leucopternis albicollis williaminae – Locally in north-western Colombia and western Venezuela.
Wing feathers are more heavily marked with black, and it has black streaks on the crown and collar. The tail band is broader and the eyes are brown.
  • Leucopternis albicollis albicollis – Northern Colombia and central Venezuela to Brazil.
Smaller than the northern forms and the wings are mostly black, with white markings. The black tail band extends to the base of the tail and the eyes are brown.

All subspecies look mainly white from below.

The identity of the birds discovered in 2000/2001 in the Serranía de las Quinchas of central Colombia  is unclear.


Calls / Vocalizations

The call of the White Hawk is a plaintive kerwee.


Diet / Feeding

The White Hawk feeds mainly on reptiles with some insects and mammals, caught in a sortie from a perch.

It associates with foraging groups of Tufted Capuchin monkeys (Cebus apella) and South American Coatis (Nasua nasua) to snatch prey startled by these animals.


Nesting / Breeding

It builds a large stick platform nest in a tree and usually lays one dark-blotched blue-white egg. An attended nest was observed in Ecuador in mid-August.


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