[cobirds] "Brewster's" Warbler, Manitou Lake, Teller Co....F2 backcross??

Jeff's great images strongly suggest that the "Brewster's" Warbler is a very rare F2 backcross (4 reported instances at the time of publication of Peterson's guide) or a bird that has resulted from the mating between two F1 hybrids (Golden-winged x Blue-winged Warbler).   

See picture in Peterson's "Field Guide to Warblers", p. 141. or google "f2 backcross Brewster's Warbler" on the Web.

Paula Hansley

Louisville

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