Mountain chickadees songs provide real-time evidence for Darwin's character displacement theory
They constantly whistle a chirpy "bee-bee-bee-bee" song to attract mates or defend their territories. Black-capped chickadees ...
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The Chickadee Birds: All About Chickadees
That watchfulness may contribute to the chickadee’s surprisingly long life span—about 10 years! Bird songs provided by the Cornell Lab of Ornithology. Chickadees are always on the move ...