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African harrier-hawk
The African harrier-hawk, harrier hawk, or gymnogene (''Polyboroides typus'') is a bird of prey. It is about 60–66 cm in length, and is related to the harriers. It breeds in most of Africa south of the Sahara. The only other member of the genus is the allopatric Madagascan harrier-hawk (''Polyboroides radiatus'').
==Description==
The African harrier-hawk is a medium-sized raptor. The upperparts, head and breast are pale grey. The belly is white with fine dark barring. The broad wings are pale grey with a black trailing edge fringed with a narrow white line. The tail is black with a single broad white band. There is a bare facial patch of variable colour, usually red or yellow. Genders are similar, but young birds have pale brown instead of grey, and dark brown replacing black. An unusual trait of this species is the double-jointed knees it possesses, which enable it to reach into otherwise inaccessible holes and cracks for prey. A comparable leg-structure and behavior can be found in the Neotropical crane hawk; a case of convergent evolution.
The call is a whistled ''sueee-sueee-sueee''.
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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