Wednesday, April 23, 2014

Yellow-rumped Warbler

Another spring arrival at our water feature was this male Yellow-rumped Warbler. I previously wrote about how western (Audubon’s) and eastern (Myrtle) populations differ. Spring males are easy—the Audubon’s Warbler’s throat is bright yellow. Myrtle’s, like this one, have white throats.
Females and fall birds can be much trickier. The middle photograph is of a fall Myrtle Warbler that I banded in September 2010, and which I used in my previous post. Note the distinct eye-line and the distinct ear (auricular) patch.  The bottom photo shows an Audubon’s Warbler. Note its more hooded appearance, with an indistinct eye-stripe and its uniformly colored sides to the head.
I handed this Audubon’s Warbler on 8 November 2004 in Aberdeen, South Dakota. Not only is this date fairly late for the species, Audubon’s Warblers are also very rare in the eastern half of the state.

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