Ring-billed Duck
grrlscientist | December 8, 2009tags: Ring-necked Duck, Ring-billed Duck, Ringneck, Aythya collaris, birds, mystery bird, bird ID quiz
[Mystery bird] Ring-necked Duck, also known as the Ring-billed Duck (a more obvious name, in my opinion) or the Ringneck, Aythya collaris, photographed in San Francisco, California. [I will identify this bird for you in 48 hours]
Image: Pete Myers, 12 November 2009 [larger view]
Please name at least one field mark that supports your identification.
Review all mystery birds to date.