Thursday, April 25, 2019

Wilson’s Warbler

When I banded this male Wilson’s Warbler on 24 April 2019, I knew this Olympia bird looked different from the Eastern birds. It seemed brighter yellow, had a huge black cap, and the forehead sported an orange tinge. All of these traits suggest the race Cardellina pussila chryseola, which breeds in coastal lowlands from southwestern British Columbia to southern California. Overall, the species nests across Canada and the western United States. Western populations show mDNA sequence diversions from eastern birds. Across their range, Wilson’s Warblers appear to be declining, presumably due to destruction of riparian habitat (Ammon and Gilbert 1999).

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