Thanks to Glenn for finding and being careful about the ID. It is just as easy for a birder to identify a birds as a more common species and therefore not arrive at the correct id as the reverse. One item field mark that Glenn did not mention that was observed by all of us present and is visible in Glenn's photos is the gape color. It is pink which is characteristic of Western Gull and none of the other large black- backed gulls except for Kelp which is excluded by mantle color, orbital ring, iris color, and leg color. It is shared with several ligh-mantled gulls. Norm Erthal Arvada CO
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