Coordinators:
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Mars Muusse
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Heermann's Gull heermannii sub-adult PB moult, July 09 2013, Pacific Grove, California USA. Picture: John Cant.
Could be younger adult / sub-adult? New central rectrices with thin white tips indicating immaturity. And only thin white tips on old secondaries. Still, head spotting not dense and brownish, rather adult-like.
Outer primaries still old. Central greater coverts missing and several inner GC very worn.
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Heermann's Gull heermannii