A colloquial name for any bird reputed to eat butter or dairy products, or to steal from dairies; historically applied to wrynecks or nuthatches.
From butter + bird, a folk term combining the animal's suspected diet with the common noun. These names often reflect rural folklore and local observation rather than scientific accuracy.
Rural communities invented 'butterbird' names to explain why their butter disappeared from windowsills—the real culprits were probably chickadees and wrynecks, but the colorful name stuck long before we had proper ornithology.
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