Fifty-eighth supplement to the American Ornithological Society's Check-list of North American Birds

This is the 21st supplement since publication of the 7th edition of the Check-list of North American Birds (American Ornithologists’ Union [AOU] 1998). It summarizes decisions made between 15 April 2020 and 15 April 2021 by the American Ornithological Society’s (formerly American Ornithologists’ Union) Committee on Classification and Nomenclature—North and Middle America. The Committee has continued to operate in the manner outlined in the 42nd Supplement (Banks et al. 2000). During the past year, Blanca E. Hernandez-Banos was added to the committee.