Brown-headed cowbird
Chapter 3: Why and How Birds Sing
Subchapter: Not one, but two voice boxes
From page 40 in the book.
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Photo by Laure Wilson Neish
♫125. Songs from a flock of seven males, just five yards overhead. May 29, 2010. Redbird Wildlife Management Area, Daniel Boone National Forest, Big Creek, Kentucky. (0:59)
♫126. Three songs excerpted from ♫125, played first at normal speed, then quarter speed. You can begin to hear the intricacies and contributions from the two voice boxes. (0:23)
♫127. An early spring flock of cowbirds. A car passes at 0:30. At 1:48, all birds flush from the roadside tree, then return. March 20, 2017. Los Osos, California. (2:07)
♫128. A selection of those same songs from the flock, slowed to quarter speed. Nice! This detail is no doubt what the cowbirds can hear. (2:06)
For ♫129 see Explore 20.