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Aythya affinis
Please, confirm!! The Greater Scaup, Aythya marila is a very similar, almost identical species to the Lesser Scaup, Aythya affinis.
According to the Cornell Lab of Ornithology, the Lesser Scaup is the only one in your area.
http://www.allaboutbirds.org/guide/Great...
http://www.allaboutbirds.org/guide/Lesse...