Broad-tailed hummingbird
Chapter 2: Birds and Their Sounds
Subchapter: Mechanical (non-vocal) sounds
From page 22 in the book.
Photo by Brian E. Small
♫66. Wing sounds, generated by an outer flight feather that vibrates with each wing stroke. June 8, 2008. Temple Canyon Park, Cañon City, Colorado. (0:06)
♫67. More wing sounds. June 8, 2008. Temple Cañon Park, Cañon City, Colorado. (0:14)