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In the Fall, Chimney Swifts congregate in large numbers in preparation for their migration to South America. At dusk they begin to circle around large chimneys, air shafts and Chimney Swift Towers. As darkeness falls they enter their night time accomodations. They are not sound sleepers and are restless in the roost where they preen, chatter with their neighbors and fly from palce to place between short naps. At first light, they usually take to the sky.
Chimney Swift song