Black-capped Chickadee--Birdbrain?

In spring, the Black-capped Chickadee  adds a new vocalization to its repertoire. When breeding season begins, the tiny brains of Black-capped Chickadees and other songbirds enlarge to enable the birds to create more sounds. After the breeding season is over and the birds no longer need that singing function, the part of the birds’ brains that controls vocalizations decreases in size. Learn more about Fernando Nottebohm's research.
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