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... species is the chimney swift, Chaetura pelagica, miscalled chimney swallow. Its spiny tail acts as a prop when it clings to the chimneys in which it builds its nest of twigs, cemented with saliva. In the W United States are the black, Vaux's, and white-throated swifts. Some Asian swifts make their entire nest of a salivary secretion; these are the nests that are used ...