The Black-collared Hawk (Busarellus nigricollis) is a species of
bird of prey in the Accipitridae family. It is monotypic within
the genus Busarellus. It is found in Argentina, Belize, Bolivia,
Brazil, Colombia, Costa Rica, Ecuador, El Salvador, French
Guiana, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama,
Paraguay, Peru, Suriname, Trinidad and Tobago, Uruguay, and
Venezuela. Its natural habitats are subtropical or tropical
moist lowland forests, subtropical or tropical swamps, and
swamps. The adult Black-collared Hawk has a more or less white
head, tinged with buff, and with black shaft streaks on the
crown. The body, above and below, and the mantle, are bright
cinnamon rufous, paler on the chest. There is a black crescent
on the upper breast. The back has scattered black shaft stripes;
the flight and tail feathers are black with the base of the tail
barred with rufous. The eyes are bright reddish brown, the cere
and bill black, and the legs bluish white. Immatures are
similar, but blotched with bla