55. Redhead (Aythya americana)

Redheads superficially resemble Pochards, but they are slightly larger, with a more rounded head and steep forehead (where Pochard's is more sloping), a less wedge-shaped bill with a different pattern, and a yellow rather than red eye.

Redhead, ©USFWS Mountain-Prairie, via Flickr Creative Commons.

Redhead sketch.