Left: A Black-capped Chickadee on Tuckernuck Island. Photograph by the author; Right: Spectrogram: one phrase from a typical Tuckernuck Black-capped Chickadee song.
Most of us who are familiar with birds in the Northeast recognize the characteristic two-note fee-bee of the Black-capped Chickadee (Poecile atricapillus). But there is a fascinating variation in this song hiding just south of Cape Cod.
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