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The population estimate for the Blue-and-white Swallow is 5,000,000 to 50,000,000 (BirdLife International 2009).
Dayer, A. A. (2010). Blue-and-white Swallow (Pygochelidon cyanoleuca), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.bawswa1.01