Original Account (1992, BNA no. 21)
I am grateful to the Center for Environmental Studies, Arizona State University, for administrative support and to the Department of Speech and Hearing Science, Arizona State University for access to the sound analysis system. I thank G. Scott Mills and Stephen M. Russell for providing observations and data. I also thank my husband, Frank M. Baucom, for his continual, enthusiastic support of my ornithological efforts. John B. Dunning reviewed the manuscript.
Revised Account (2019, version 2.0)
Peter Pyle contributed plumage and molt descriptions in the Appearance article and Michael Patten contributed text for the Systematics article.