Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
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Transcription
Cogswell
1948
Aythya marila
1
Nov. 5 - N. of E. end of Oakland Bay Bridge, Alameda Co., Calif.
14:00-15:00 - at least 2 of the scaup ducks which flew past us had a long white stripe in wing to well beyond the bend (i.e. - well out primaries). These at least I feel sure were of this species, and I suspect that quite a number were present among the much more abundant A. affinis