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Aug 27 2011

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Red-thighed Sparrowhawk (Accipiter erythropus)

Red-thighed Sparrowhawk

[order] ACCIPITRIFORMES | [family] Accipitridae | [latin] Accipiter erythropus | [authority] Hartlaub, 1855 | [UK] Red-thighed Sparrowhawk | [FR] Epervier de Hartlaub | [DE] Waldsperber | [ES] Gavilanchito Muslirrojo | [NL] Westafrikaanse Dwergsperwer

Subspecies

Monotypic species

Genus

Members of the genus Accipiter are small and medium-sized hawks, often called Sparrow-hawks or Goshawks. The females are almost invariably much larger than the males – in some cases weighing twice as much – a level of size dimorphism only exceptionally reached in any other genus Falconiformes. Their wings are short and rounded; the tail usually quite long. They are well adapted for flying through dense bush. Bird-catching Sparrow-hawks generally have long and slender legs, with slender digits, the middle one being especially long. Goshawks are usually larger, with shorter, thicker tarsi and digits and a shorter middle digit. Some smaller species have goshawk-like feet and vice versa, making it difficult on a world-wide basis to subdivide the genus on this or any other broad basis. Although many accipiters feed upon birds moreso than do other hawks, some species take many mammals, especially squirrels; others take lizards, frogs, snakes, insects, even snails. In these species the legs and digits are sometimes slender, but short. Accipiters are rarely crested, but some have very attractive colour patterns. Black phases are present, especially in the tropical species. One in Australia has the only pure white phase. Accipiter is the largest genus in the family, having about fifty species. It is present worldwide, but is especially rich in Papua-New Guinea, where a small island like New Britain may have three to five endemic species or distinct sub-species.

Physical charateristics

All blackish dark grey above except for conspicuous, white rump. Note also the small, white spots on scapulars and on all but central tail feathers. Eye red (not yellow as African Little Sparrowhawk). Yellow-eyed immature shows fine barring below, barred or washed rufous. Named after the red feathering on the thighs of the male. White bars across spread tail are a mark in the field.


wingspan min.: 0 cm wingspan max.: 0 cm
size min.: 23 cm size max.: 27 cm
incubation min.: 0 days incubation max.: 0 days
fledging min.: 0 days fledging max.: 0 days
broods: 1   eggs min.: 1  
      eggs max.: 3  

Range

Africa : West, Westcentral

Habitat

Occurs in lowland primary forest, along forest edges, and in older secondary forest. A secretive species that spends much of its time perched in the interior of the forest. Active mainly in early morning and late afternoon

Reproduction

Builds a tiny stick nest placed in the upper fork of a forest tree. Clutch size is 2 eggs. Incubation and nestling periods are apparently unrecorded

Feeding habits

Feeds on small birds up to the size of pigeons, lizards, amphibians, and insects, which it captures in quick dashes from a perch in the forest understory. Harasses mixed-species bird flocks, often hunting in pairs

Conservation

This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size may be moderately small to large, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
Red-thighed Sparrowhawk status Least Concern

Migration

Unknown, but probably non-migratory

Distribution map

Red-thighed Sparrowhawk distribution range map

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