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Chimney Swift is the only swift that occurs regularly in the east. It once nested in hollow trees, but today it nearly always nests in chimneys or other human-made structures. Because the bird can be easily captured and banded in such situations, it has been studied much more thoroughly than other North American swifts. In late summer, hundreds or even thousands of individuals may roost in one large chimney, gathering in spectacular flocks overhead near dusk.