Black-crowned Tchagra
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[Photo] Brown-crowned Tchagra, Tchagra australis (above) and Black-crowned Tchagra, Tchagra senegala (bottom) adult males. Source Transvaal Museum, Pretoria. Date 24 June 1908. Author Claude Gibney Finch-Davies (1875-1920)
The Black-crowned Tchagra (Tchagra senegala) is a bushshrike. This family of passerine birds is closely related to the true shrikes in the family Laniidae, and was once included in that group.
This species is found in the Arabian peninsula and most of Africa in scrub, open woodland, semi-desert and cultivation.
Identification
Black-crowned Tchagra is a colourful and unmistakable species, 19-22 cm in length. It has a black crown and eye stripes separated by a broad white supercilium. The underparts are pale grey and the upperparts pale brown. The folded wings are chestnut and the tail is black, tipped white. The bill is black.
Sexes are similar, but young birds have a brown cap and a pale yellow bill. There are 14 subspecies, varying in size and the colour of the back, underparts and eyestripe.
Black-crowned Tchagra has a descending whistling song, Chee-chee chee cheroo cheroo, and can be readily tempted in to sight by imitating this call, presumably because the bird is concerned that there is an intruder in its territory. The male also has a switchback display flight.
Behaviour
Black-crowned Tchagra lays two or three heavily marked white eggs in a cup nest in a tree or bush. Both sexes, but mainly the female, incubate for 12-15 days to hatching; the chicks fledge after another 15 days.
It is similar in habits to the shrikes, hunting insects and other small prey from a perch in a bush, although it sits less conspicuously than true shrikes.
http://en.wikipedia.org/wiki/Black-crowned_Tchagra
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