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Mid-sezed diving duck with grey and white back black tail and head and a blue/grey bill.
Bolsa Chica, Wetlands
These actually look more like Lesser Scaups. Greater should never show any peeking in the back of their heads like your birds do and would have larger, stockier bills with wider nails to the tips. Among these field marks, Greater would show very puffy cheeks (which would be visible when looking straight on with the bird), a steeper forehead, etc...
Spotted on Dec 23, 2016 Submitted on Dec 24, 2016