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whistling kite
The whistling kite (''Haliastur sphenurus'') is a medium-sized diurnal raptor found throughout Australia (including coastal islands), New Caledonia and much of New Guinea (excluding the central mountains and the northwest). Also called the whistling eagle or whistling hawk,〔 it is named for its loud whistling call, which it often gives in flight. Some authorities put this species in the genus ''Milvus'', despite marked differences in behaviour, voice and plumage between this species and other members of that genus.〔
==Description==
The whistling kite ranges in size from , with a wingspan between .〔 Weights range from an average of 600g-750g for males and 750g-1000g for females.〔 As with most raptors, females are larger and heavier than males; though there is considerable overlap between the sexes, females can be up to 21% larger and 42% heavier. Southern birds are also larger than those found in the tropics.〔 Male and female plumages are the same. Adult birds are a pale buff on the head, breast and tail, with browner wings and black flight feathers. Immature birds are a heavily streaked reddish-brown with prominent pale spots on the wings. Throughout their lives, whistling kites have bone-colored legs and feet, which are unfeathered. Overall, the whistling kite looks small-headed and long-tailed, with wingtips falling well short of the tail tip when the bird is perched. Though its legs are short, the bird walks easily on the ground.〔 Whistling kites soar on slightly bowed wings, with their long flight feathers often well-splayed. The striking pattern on their underwings is distinctive.
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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