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Mexican Species
| Greater Scaup (Aythya marila) | |||
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| Subspecies | Hide subspecies | ||
| marila | Breeds in northern Eurasia; winters to the Mediterranean region, India, Japan, Korea, and China | ||
| nearctica | Breeds northern North America; winters south to the southern United States and northwestern Mexico | ||
| Endemic status | Not endemic | ||
| Sound Guide | |||
| Comment | In winter plumage the female shows pronounced silver gray vermiculation to the back, which at first glance could make it look like a young male starting to acquire the gray back. But the white face patch of the female will probably always be so well-marked that doubts about sex should be excluded. | ||
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