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The Carolina Chickadee is very similar to the Black-capped Chickadee and replaces it in the southeastern states. Living in milder climates, it has been reported to be less of a visitor to bird feeders, but it does come into suburban yards for sunflower seeds. Where the ranges of Black-capped and Carolina chickadees come together, they often interbreed. In these contact zones, they also can learn to imitate each other's songs -- causing great confusion for birdwatchers.