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The Greater Scaup (Aythya marila) is of the family Anatidae which is in the genus Aythya. This diving duck breeds in the arctic regions of North America and Eurasia. In late autumn it migrates south to spend the winter in the southern parts of its range along coasts as well as on ice free lakes and lagoons. In North America, it can be confused with Lesser Scaup (Aythya affinis) and similarly in Eurasia with Tufted Duck (Aythya fuligula), especially in the case of females or immatures.
Patrick J. O'Keeffe / Raw Birds
Greater Scaup (Aythya marila) distribution map
Breeding Non breeding - winter
UND77, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons