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grey kestrel
The grey kestrel (''Falco ardosiaceus'') is an African bird of prey belonging to the falcon family Falconidae. Its closest relatives are the banded kestrel and Dickinson's kestrel and the three are sometimes placed in the subgenus ''Dissodectes''.
==Description==
It is a fairly small, stocky kestrel with a large, flat-topped head and fairly short wings that don't reach past the tip of the tail when at rest. It is 28–33 cm long with a wingspan of 58–72 cm and a weight of up to 300 grams. The female is 4-11% larger and 5-11% heavier than the male. The plumage of the adult is uniformly dark grey apart from darker wingtips, faint dark streaking on the body and slightly barred flight feathers. The feet and cere are yellow and there is bare yellow skin around the eye. The most similar species is the sooty falcon which has a more rounded head, long wings extending past the tail and less yellow around the eye.
Juvenile grey kestrels are browner than the adults with a greenish cere and greenish around the eye. Juvenile Dickinson's kestrels are similar but have a barred tail and a more strongly barred underwing.
The grey kestrel is generally silent outside the breeding season but has a shrill, chattering call and a rattling whistle.
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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