African Harrier Hawk (Polyboroides typus)The African harrier hawk is one of only two birds of prey t
African Harrier Hawk (Polyboroides typus)The African harrier hawk is one of only two birds of prey that has double-jointed knees. It uses these joints to hunt animals in cracks and holes in cliffsides and trees. One of its favored foods is the sociable weaver (Geranospiza caerulescen), which creates massive nests with other members of its species. Nom nom nom. Album of Abyssinian Birds and Mammals. Louis Agassiz Fuertes, 1928. -- source link
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