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tufted duck
The Tufted duck (''Aythya fuligula'') is a small diving duck with a population of close to one million birds.
== Description ==
The adult male is all black except for white flanks and a blue-grey bill. It has an obvious head tuft that gives the species its name. The adult female is brown with paler flanks, and is more easily confused with other diving ducks. In particular, some have white around the bill base which resembles the scaup species, although the white is never as extensive as in those ducks. The females' call is a harsh, growling "karr", mostly given in flight. The males are mostly silent but they make whistles during courtship based on a simple "wit-oo".
The only duck which is at all similar is the drake greater scaup which however has no tuft and a different call.
The tufted duck is one of the species to which the ''Agreement on the Conservation of African-Eurasian Migratory Waterbirds'' (AEWA) applies.
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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