The African harrier-hawk, harrier hawk, or gymnogene (Polyboroides typus) has a bare facial patch, variable in colour, but often bright yellow. When it calls near the nest, this patch becomes pink, and during display, face becomes almost red, with various shades of orange between yellow and red. 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. The African harrier-hawk can be found in natural woodland, tree plantations and urban areas. It builds a stick nest in the fork of a tree or the crown of a palm tree.
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