Monday, August 16, 2010

Canada Warbler

Awaiting me on the last net check of Sunday evening was the second confusing fall warbler of the season: a hatching-year female Canada Warbler.  I startled at the white eye-ring: a Connecticut Warbler?  No, the very faint gray necklace and grayish back proclaimed Canada Warbler.  How subdued this plumage is compared to the brilliant spring male below!

This warbler winters from Columbia and Venezuela south to Peru and Brazil.  Although a fairly common breeder in northern Minnesota, and a common migrant elsewhere in the state, Canada Warbler populations have been declining in North America at a rate of about 2% a year, presumably due to deforestation in both the breeding and wintering range (Reitsma et. al 2010).

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