"Mangrove" Warbler (Yellow Warbler subsp.)
Back view of a vagrant male in San Diego, California January 20, 2009.
Thought by some authorities to be a separate species, but not by the AOU. One suspects that the warbler itself is less concerned than are attendant birders. A native of mangrove swamps from semi-tropical Mexico to northern South America.
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Taken on January 20, 2009