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Grey-headed fish eagle
The grey-headed fish eagle (''Ichthyophaga ichthyaetus'') is a fish-eating bird of prey from South East Asia.〔 It is a large stocky raptor with adults having dark brown upper body, grey head and lighter underbelly and white legs.〔 Juveniles are paler with darker streaking. It is often confused with the lesser fish eagle (''Ichthyophaga humilis'') and the Pallas's fish eagle. The lesser fish eagle is similar in plumage but smaller and the Pallas’s fish eagle shares the same habitat and feeding behaviour but is larger with longer wings and darker underparts.〔 Is often called tank eagle in Sri Lanka due to is fondness for irrigation tanks.〔 ''Ichthyaetus'' come from the Greek terms meaning fish-eagle, ichtys-fish and aetos-eagle.
== Taxonomy ==
The grey-headed fish eagle is included in the order Accipitriformes and the family Accipitridae, which includes most birds of prey except for the ospreys and falcons.〔 Lerner & Mindell placed the grey-headed fish eagle in the subfamily Haliaeetinae, which includes the genera ''Haliaeetus'' (sea eagles) and ''Ichthyophaga'' (fish eagles).〔 It was first described by Horsfield in 1841 as ''Falco ichthyaetus''.〔 It is a monotypic species of the genus ''Ichthyophaga'' and forms a paraphyletic group with the genus ''Haliaeetus''.〔 This paraphyletic group forms a close sister relationship with the subfamily Milvinae (composed of two genera, ''Milvus'' and ''Haliatur''), based on the shared trait of basal fusion of the second and third phalanges found only in these two groups.〔
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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