White-rumped Hawk Parabuteo leucorrhous Scientific name definitions
- LC Least Concern
- Names (27)
- Monotypic
Text last updated September 15, 2015
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Species names in all available languages
Language | Common name |
---|---|
Catalan | aligot culblanc |
Czech | káně bělokostřečná |
Dutch | Witstuitbuizerd |
English | White-rumped Hawk |
English (United States) | White-rumped Hawk |
Finnish | pilvihiirihaukka |
French | Buse cul-blanc |
French (France) | Buse cul-blanc |
German | Weißbürzelbussard |
Japanese | コシジロノスリ |
Norwegian | hvitgumpvåk |
Polish | myszołowiec czarnoskrzydły |
Portuguese (Brazil) | gavião-de-sobre-branco |
Portuguese (Portugal) | Bútio-de-sobre-branco |
Russian | Белопоясничный канюк |
Serbian | Mali beloleđi mišar |
Slovak | myšiak čierny |
Spanish | Busardo Culiblanco |
Spanish (Argentina) | Taguató Negro |
Spanish (Ecuador) | Gavilán Lomiblanco |
Spanish (Paraguay) | Taguató negro |
Spanish (Peru) | Aguilucho de Lomo Blanco |
Spanish (Spain) | Busardo culiblanco |
Spanish (Venezuela) | Gavilán Rabadilla Blanca |
Swedish | vitgumpsvråk |
Turkish | Ak Sokumlu Şahin |
Ukrainian | Канюк чорний |
Parabuteo leucorrhous (Quoy & Gaimard, 1824)
Definitions
- PARABUTEO
- leucorrhoa / leucorrhoea / leucorrhous
The Key to Scientific Names
Legend Overview
Introduction
The White-rumped Hawk is a very small raptor of humid montane forest with two apparently disjunct populations: it is found in the Andes from Venezuela to south to Bolivia, and also in the forested regions of Paraguay, southwestern Brazil, Uruguay and northern Argentina. In the Andes it is most often seen in soaring flight low over the canopy of fairly broken forest . There are very few observations of active foraging and so there is very little information on its diet, though it is known to take reptiles, frogs, insects and rats. As indicated by its common name, the most distinguishing characteristic of the White-rumped Hawk is its obvious white rump and under tail coverts, which contrast strongly with its all black chest, head, wings and back. When seen from below, the white-checkered underwing coverts and fairly long banded tail are conspicuous.
Field Identification
33–40 cm (1); male 290 g (n = 1), female 389 g (n = 1) (1); wingspan 67–79 cm (1). Small buteonine; deep blackish overall, with conspicuous white rump and undertail coverts and creamy white underwing coverts; thighs rufous; tail, from above has single narrow greyish-brown band in distal half, from below 2–3 white bands. Existence of pale morph, similar to that of B. brachyurus, has been claimed, but no clear evidence. Irides , cere, legs and feet yellow. Female similar to male, but slightly larger. Immature brown above, mottled with rufous; below heavily mottled rufous.
Systematics History
Previously placed in genus Buteo. In order to avoid apparent paraphyly, recent genetic study proposed resurrection of genus Percnohierax for this species (2), but such treatment shown to be unnecessary (3). Monotypic.
Subspecies
Distribution
Mountains of Venezuela and Colombia through Ecuador and Peru to Bolivia (La Paz, Cochabamba, Chuquisaca (4) ); Paraguay, S Brazil (but recorded N to Bahia) and N Argentina (Salta, Tucumán, Chaco and Misiones).
Habitat
Dense higher-elevation forest, forest edge and Chaco; tropical to subtropical zones, occasionally to temperate; in subtropical zone, prefers dense forest. Occurs mostly at 1500–2900 m in Colombia, 1650–2500 m in Peru, and up to 3500 m in Bolivia; at lower elevations in Argentina (Misiones) and Paraguay.
Movement
Thought to be mostly sedentary, but periodically wanders, suggesting species is somewhat nomadic (1).
Diet and Foraging
Very little information available; known to take reptiles, frogs, insects and rats. Adult fed fledged juvenile "three small mouse-sized mammals" in Ecuador (5).
Sounds and Vocal Behavior
Typically a high-pitched whistle, with some variations however. Either a short note with a faint but conspicuous two-step dropping in pitch at the very end KEEEEiu . Also a longer, more monotonous high-pitched whistle , which sometimes ends in a quavering.
Breeding
One nest active Feb–Mar in Colombia; in Ecuador, copulation observed in early Jun (6), and adult seen feeding juvenile in early Jan (5). Clutch 2–3 eggs (Argentina). A nest with 2 eggs found in early Oct in S Brazil was on top of a Pinus elliottii, 22 m above the ground; nest a low cup made of small pine branches and sticks of other plants, lined with a few green leaves, 54 cm long, 38 cm wide and 18 cm deep; eggs creamy-white with rust-brown scrawls and spots, 42·6 mm × 34·7 mm and 44·5 mm × 34·5 mm (7). No further information available.
Conservation Status
Not globally threatened (Least Concern). CITES II. Very little known, and status uncertain; generally rather local and nowhere common, but tolerates somewhat disturbed forest, so probably not threatened. No quantitative estimates have been made of global population size or population trends. In Argentina, seems to have decreased in response to deforestation; no recent records in NE Argentina. More data needed.