Original Account (2001, BNA no. 577, version 1.0)
We wish to thank R. Bayer, R. W. Campbell, H. R. Carter, S. N. G. Howell, K. D. Hyrenback, B. Tershy, L. B. Spear, and T. R. Wahl for their unpublished information and counsel. S. N. G. Howell brought to our attention, especially, the white shafts of primaries, and provided several photos, as did R. Stallcup. WTE's research on this species supported by W. M. Keck Foundation and San Diego County Fish and Wildlife Advisory Commission; work on Islas Coronado in cooperation with Centro de Investigacion Cientifica y Educacion Superior de Ensenada (CICESE). Numerous persons have assisted in field work. National Information Services Corporation provided a literature search. The assistance of BNA editors A. Poole, K. Russell, and D. Kroodsma and staff of the Borror Laboratory of Bioacoustics at Ohio State University is greatly appreciated.
Revised Account (June 2019, version 2.0)
YBG’s research on this species supported by the Deutsche Forschungsgemeinschaft DFG (Projektnummer QU148/7), the National Fish and Wildlife Foundation, the David and Lucile Packard Foundation, the Marisla Foundation, Grupo de Ecología y Conservación de Islas, A.C, and S.C.P.P. Pescadores Nacionales de Abulón. Peter Pyle contributed plumage and molt descriptions in the Appearance article and David Mindell contributed text for the Systematics article.