Larus thayeri

Mystery Bird: Thayer's Gull, Larus thayeri

grrlscientist | May 28, 2009

tags: Thayer's Gull, Larus thayeri, birds, mystery bird, bird ID quiz [Mystery bird] Thayer's Gull, Larus thayeri, photographed on the Pacific coastline of San Francisco, California. [I will identify this bird for you tomorrow] Image: Terry Sohl, 18 December 2008 [larger view] Photo taken with a Canon 50D, 400 5.6L. Please name at least one field mark that supports your identification. Review all mystery birds to date.

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