McCown’s longspur
Chapter 7: When to Sing, and How
Subchapter: Songs and calls in flight
From page 134 in the book.
Photo by Wil Hershberger
♫548. A tinkling, tumbling array of song notes as he parachutes back to earth. May 30, 2006. Murphy's Pasture, Pawnee National Grassland, Colorado. (4:58)