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This photo of a Thayer's Gull was taken on December 18th, 2008 on the Pacific coastline of San Francisco, California. The bird is at least a Thayer's hybrid, if not a pure Thayer's. Given the evidence of all the photos (size, light mantle, dark wingtips above with little if any dark on the underside of the wingtips, bill size and shape, eye, etc.), most folks have called it a pure Thayer's. There are a few folks who have called it a "Kumlien's Gull", which is a cross between a Thayer's Gull and the very closely related Iceland Gull. Taken with Canon 50D, 400 5.6L lens.
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