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Black-collared Hawk
Busarellus nigricollis

Status: Lower risk

Population Trend: Unknown.

Other Names: Chestnut Hawk, Collared Fishing Buzzard, Collared Fishing Hawk, Fishing Buzzard, Fishing Hawk.

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Busarellus nigricollis
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Distribution: Neotropical. Central MEXICO south through Central America and east of the Andes through Amazonia to northern ARGENTINA. more....

Subspecies: 2 races. B. n. nigricollis : Central MEXICO (Sinaloa, Veracruz) south along both slopes of Central America to Amazonia, west to eastern ECUADOR and eastern PERU, east to the GUIANAS and south through eastern BOLIVIA to southern BRAZIL; TRINIDAD; B. n. leucocephalus : PARAGUAY, URUGUAY, and northern ARGENTINA (Salta, Santa Fe, Corrientes).

Taxonomy: Olson (1982) presented morphological evidence that this species belongs near the milvine kites (Milvus, Haliastur, Haliaeetus, Ichthyophaga), instead of with the sub-buteonine hawks, but Friedmann (1950), Wetmore (1965), Meyer de Schauensee (1970), Amadon (1982), and Amadon and Bull (1988) placed it near Buteogallus and Parabuteo.  Although the linear sequence of the AOU (1998) was re-arranged to reflect Olson's view, more recent authors have concurred with the latter opinion. Based on analyses of the sequences of both mitochondrial and nuclear genes, Lerner et al. (2008) confirmed that Busarellus belongs in the Buteoninae. More recently, Amaral et al. (2009) showed that this genus belongs to a clade also containing Rostrhamus sociabilis and Geranospiza caerulescens, based on more detailed studies with mitochondrial and nuclear genes. This clade is a sister group to the other buteonines, except for Ictinia< and Butastur.

Movements: Irruptive or local migrant (Bildstein 2006), probably in response to changing water conditions.

Habitat and Habits: Occurs in lowlands, frequenting areas of still or slow-moving water, including mangroves, marshes, lagoons, riverine forests, ox-bows, swamp forests, flooded fields, and landlocked ponds in mostly open country, and its distribution closely coincides with the presence of these watered habitats. Soars frequently, often to great heights. Occurs singly, or occasionally in pairs, and is rather sluggish. Frequently unwary. more....

Food and Feeding Behavior: Feeds on fishes, frogs, small birds, mammals, aquatic insects, crustacea, and mollusks. Perches overlooking water, often on a low perch. Hunts from elevated shoreline perches and captures fish and other aquatic organisms by swooping to the water surface (but not diving) and grabbing prey from the water surface (Remsen 1990), then returning to a perch to eat it. Unlike the Osprey, this fishing specialist does not have a waterproof plumage or an oversized toe, but it does have conical dermal spikes on the undersides of its toes and long, curved talons, adaptations for capturing fish (Wetmore 1965). more....

Breeding: The nest is a large platform of sticks located in the upper portions of a high tree, or in mangroves. Clutch size is 1-2 eggs, which are whitish to greenish-white, strongly marked with brown, reddish, and lilac-gray. The nestling period at Argentine nests was between 59-66 days (Di Giacomo 2005). more....

Conservation: Generally uncommon and of local occurrence in many parts of its range, but not at risk at the species level. However, its dependence on wetlands makes it vulnerable, especially in Mexico and Central America, where it is regarded as rare (or absent) in every country. Despite its extensive range throughout the humid Neotropics, this species has apparently never been the subject of a detailed life history study. Categorized as a species of "Least Concern" by BirdLife International. more....

Important References: 
Bierregaard, R.O. 1994. Black-collared Hawk. Pp. 174-175 in del Hoyo, J.,
  A. Elliott, and J. Sargatal (eds). Handbook of birds of the world. Vol. 2.
  New World vultures to guineafowl. Lynx Edicions, Barcelona, Spain.
Blake, E.R. 1977. Manual of Neotropical birds. 1. Sphenisicdae (penguins)
  to Laridae (gulls and terns). University of Chicago Press, Chicago, IL.
Ferguson-Lees, J., and D.A. Christie. 2001. Raptors of the world. Houghton
  Mifflin, Boston, MA.

Sites of Interest:
Black-collared Hawk photos.
Aves de Rapina do Brasil
Species account with emphasis on Brazil.

Campbell-Thompson, Edwin
Phillips, Ryan

Last modified: 11/20/2010

Recommended Citation: Global Raptor Information Network. 2020. Species account: Black-collared Hawk Busarellus nigricollis. Downloaded from http://www.globalraptors.org on 7 Jul. 2020

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