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mcgill.ca
doi-org.proxy3.library.mcgill.ca
Winkler, David W.; Billerman, Shawn M.; Lovette, Irby J. (2020), Billerman, Shawn M; Keeney, Brooke K; Rodewald, Paul G; Schulenberg, Thomas S (eds.), "Hoopoes (Upupidae)", Birds of the World, Cornell Lab of Ornithology, doi:10.2173/bow.upupid1.01, retrieved 2020-10-13