Geographical distribution of American black swift.    Breeding  Migration  Year-round
Gunn, C., J. B. Beason, K. Potter, and M. Webb (2013). Black Swift (Cypseloides niger), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.blkswi.01
Cephas