The Broad-Tailed Hummingbird nests in the Rocky Mountains. The adult male makes a loud whirring sound, which is produced by a slot in the tenth (outer) primary.
U.S. Breeding Range:
Map courtesy of Patuxent Wildlife Research Center, United States Department of the Interior, Laurel, MD. From THE NORTH AMERICAN BREEDING BIRD SURVEY RESULTS AND ANALYSIS, Version 96.3 by J. R. Sauer, J.E. Hines, G. Gough, I. Thomas, B.J. Peterjohn.