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blue swallow
The blue swallow (''Hirundo atrocaerulea'') is a small passerine bird in the swallow family. Swallows are somewhat similar in habits and appearance to other aerial insectivores, such as the related martins and the unrelated swifts (order Apodiformes). It breeds in southern Africa, wintering further north in Uganda and Kenya.
This bird breeds in montane grassland, preferring high rainfall, undulating areas. In winter it prefers open grassland, with bushes and trees. The nest is usually attached to the roof or side of a hole in the ground.〔(BirdLife Species Factsheet )〕
==Description==
This species is a small swallow at 18–25 cm. The adult birds have a highly lustrous dark metallic steel-blue appearance with long tail streamers, which are particularly noticeable in males. White feathers are visible on the rump and flanks when the birds are preening and especially during courtship. In poor light, blue swallows appear almost black and therefore can be mistaken for black saw-wing swallows (''Psalidoprocne spp.'') which occur throughout its breeding range. Young blue swallows start life a brownish-grey, acquiring their blue colour as they mature. This species has a musical "bee-bee-bee-bee" call when in flight.〔(Blue Swallow, ''Hirundo atrocaerulea'' ) BirdLife International (May, 2005). Retrieved 2011-08-24.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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