Yellow-headed blackbird
Chapter 3: Why and How Birds Sing
Subchapter: Why sing?
From page 30 in the book.
Photo by Wil Hershberger
♫88. Male vocal contortions, in song, of two types. June 19, 2008. Arapaho National Wildlife Refuge, Walden, Colorado. (1:22)
♫89. Half an hour in a yellow-headed community. Hear adults calling and singing (both song forms), with fledglings calling for food in the background. Early morning, after sunrise. June 9, 2018. Sierra Valley, California. (30:32)