Small with slender tube-shaped body and very long, narrow, curved wings. Dark gray-brown overall with a slightly paler throat.© Peter Finley | Macaulay LibraryIndiana, August 20, 2020
Tube or cigar-shaped body with long curved wings and a short tail. Dark gray-brown overall.© Anonymous | Macaulay LibraryMassachusetts, June 26, 2018
Flies fast, often in loose feeding flocks, with very stiff wingbeats and almost no bend at the wrist. Often gives a chittering call while in flight.© Timothy Barksdale | Macaulay LibraryArkansas, April 01, 2004
Does not perch, clings to the walls of chimneys and other vertical surfaces with its tiny feet.© David Schrab | Macaulay LibraryWisconsin, July 16, 2017
Nests in chimneys and on other vertical surfaces in dim, enclosed areas, including air vents, wells, hollow trees, and caves.© Ryan Treves | Macaulay LibraryWisconsin, August 21, 2016
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