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Carolina/Black-capped Chickidee



Today at about 5400 ft. elevation I heard a chickidee song that seemed
intermediate between Black-capped and Carolina. It had some of the higher
pitched song of the Black-capped but added a phrase that was lower.
I know these two species interbreed but to hybrids sing an intermediate
song?
                                                   Reece
Reece 'n Judy Mitchell
Flat Rock, NC
rmitche2@tds.net