Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Remsen,
J.V.
1978
Yellow-billed Loon
Gavia adamsii
Monterey Bay boat trip [cont]
Feb.12 of critical observation, but soon after became decidedly
[cont] uncooperative.
The only other large-billed loon, the Common, has
an all dark culmen, lacks the auricular patch,
when
the bill is pale it is grayish not yellow, etc.