Description
The Crested Shelduck is sexually dimorphic, with the male possessing a greenish-black crown, breast, primaries, and tail, while the rest of its face, chin, and throat are brownish black. The male's belly, undertail coverts, and flanks are a dark grey with black striations. The upper wing coverlets are white, while its speculum is an iridescent green. The female has a large white eye ring, black crest, and white face, chin, throat, neck, and upper wing coverts. It also has a dark brown body with white striations. Both sexes have a green tuft of feathers protruding from their head. The Crested Shelduck is about 63 to 71 centimetres (25 to 28 in) long, and therefore is slightly larger than a Mallard. Its wingspan is about 31 to 32 centimetres (12 to 13 in). Its bill and legs are pinkish, though those of the female are paler than those of the male. The bill of the male has a small, knob-like appendage at its base. The plumage of the immature is unknown.
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