Black-Capped Chickadee (Poecile atricapillus): Little flocks of Black-capped Chickadees enliven the winter woods with their active behavior and their cheery-sounding chick-a-dee call notes as they fly from tree to tree. This very popular bird is always welcomed at bird feeders, where it may take sunflower seeds one at time and fly away to stuff them into bark crevices. Chickadees double their feathers from 1,200 to over 2,000, which helps them bulk up for winter. To survive the dipping temperatures at night, they roost in tree cavities with other chickadees, huddling to keep warm. They also can fluff up their feathers, which reduces heat loss by 30% and make them appear much larger than their real size.
Source: https://www.audubon.org/field-guide/; Feathers by Stan Tekiela
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