List of U.S. state birds

Descriptive Catalog of the Birds of Illinois," part I of Ridgway, Robert, and Forbes, S.A., The Ornithology of Illinois. State Laboratory of Natural History

H.; Steadman, D.W.; Witt, C.C.; Yuri, T. (2008). „A Phylogenomic Study of Birds Reveals Their Evolutionary History”. Science. 320 (5884): 1763–68. Bibcode:2008Sci

-Cities/Charter_Cities-List, accesat în 7 aprilie 2020  Lipsește sau este vid: |title= (ajutor) ^ https://www.ci.vallejo.ca.us/cms/one.aspx

Clements Checklist of Birds of the World (ed. 6th). Ithaca: Cornell University Press. ISBN 978-0-8014-4501-9.  ^ „Welcome”. IOC World Bird List 9.2. doi:10.14344/ioc

T22723819A132024136.en . Accesat în 12 noiembrie 2021.  ^ „Birds Protected by the Migratory Bird Treaty Act”. U.S. Fish and Wildlife Service. Arhivat din original