Sunday, October 16, 2011

Fox Sparrow

This Fox Sparrow, which I banded on 8 October 2010, was the first of this species that I listed this year. Because Fox Sparrows are normally common migrants, I am surprised that I did not list it last spring. Perhaps this lapse was due to last year's harsh winter. Freezing rain and deep snow during the winter and spring migration can cause high mortality for this sparrow (Weckstein et al, 2002). In the long run, nevertheless, Fox Sparrow population trends appear to be relatively stable. In a previous post, on 27 March 2010, I blogged about the complexity of Fox Sparrow races (some of which, within the near future, may be elevated to species status).

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