John James Audubon named this bird while he was in South Carolina. The curious, intelligent Carolina Chickadee looks very much like a Black-capped Chickadee, with a black cap, black bib, gray wings and back, and whitish underside. Carolina and Black-capped chickadees hybridize in the area where their ranges overlap, but the two species probably diverged more than 250,000 years ago. Where the two species ranges come in contact, the Carolina and Black-capped chickadees occasionally hybridize. Hybrids can sing the songs of either species, or might sing something intermediate. Both species are identical to the naked eye.
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