Original Account (January 1995, BNA no. 194, version 1.0)
We thank our coworkers Carl Bock, Janis Dickinson, Alan de Queiroz, Morné Du Plessis, Tom Edwards, Susan Hannon, Joey Haydock, Katy Heck, Roxana Jansma, Nancy Joste, Dave Ligon, Frank Pitelka, Wes Weathers, and Bob Zink as well as our many field assistants over the years whose extensive efforts helped provide much of the material summarized here. Lloyd Kiff, Peter Pyle, Sam Sumida, and Brian Williams provided unpublished information or preprints, and Ralph Browning, Robert Chandler, Kenn Kaufman, Alan Poole, and Keith Russell commented on the manuscript. Keith Arnold and the Texas Breeding Bird Atlas Project at Texas A&M University supplied information on the Texas distribution. Substantial support for much of the work summarized here was provided by the National Science Foundation.
Revised Account (September 2019, version 2.0)
We thank our more recent coworkers and collaborators including Sahas Barve, Anna Brownson, Hannah Dugdale, Natasha Hagemeyer, Jay McEntee, Mario Pesendorfer, Justyn Stahl, and David Winkler, as well as the dozens of additional field assistants who have contributed to the project since 1995 and the continued support of the National Science Foundation. Peter Pyle contributed plumage and molt descriptions in the Appearance article and Michael Patten contributed text for the Systematics article.