Saturday, September 26, 2015

Black-throated Blue Warbler 2

On Thursday I posted an account of our seeing a male Black-throated Blue Warbler on Long Key last April. The same evening, I banded a female here in Northfield, Minnesota. You may recall that I wrote that ornithologists did not believe initially that the sexes belonged to the same species. This female is identified by her olive coloration and small, white, wing spots.

Black-throated Blue Warblers breed in the arrowhead of Minnesota and mainly migrate on the East Coast of the United States. Thus southeastern Minnesota is on the periphery of their migratory range. I also listed about two-dozen Black-throated Blues in eastern South Dakota. One might hypothesize that these birds are heading for the western-most wintering grounds in the Yucatan, Belize and Honduras. It would be great to get a recovery of one of these banded birds. Nevertheless, eBird maps show many records from the western United States.

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