The most significant knock against this bird is the lack of a completely black leading edge to P9. Instead, the mirror spans both webs – a trait shown only by a minority of Thayer's Gulls and making it more difficult to rule out an extreme Kumlien's Gull or intergrade. The notable contrast between the black outer web of P10 and the much greyer inner web is similarly problematic.- Photo: Jared Clarke (March 1, 2009)
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