Answer: Chimney swifts is the birds that are supposed to be in the chimney and they nest in chimneys quite skillfully and successfully. Swifts may also nest in wells, and even on a sheltered brick wall of an abandoned building. Chimney Swifts are most noticeable during migration, when birds numbering in the thousands circle in large tornado-like flocks above roosting chimneys at dusk, and then suddenly descend in ever-narrowing vortices into their depths to spend the night.
Many aspects of Chimney Swift life history remains unknown, primarily because so much of this bird's day is spent in wide-ranging, fast flight and because its nesting and roosting occur in dark, largely inaccessible sites.
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