Wood thrush
Chapter 3: Why and How Birds Sing
Subchapter: Not one, but two voice boxes
From page 39 in the book.
Photo by Wil Hershberger
♫116. Wood thrush normal singing, 43 songs in a little over two minutes. May 3, 2002. Amherst, Massachusetts. (2:06)
♫117. The first six wood thrush songs in ♫116 slowed down to quarter speed. (0:46)
♫118. Those same six songs slowed to one-eighth speed. (1:19)
♫119. The contributions of left and right voice boxes isolated for five flourishes. For each of five wood thrush songs, listen (in headphones) first to a complete normal song. Then we listen to just the terminal flourish of that song, at one-eighth normal speed, in three segments: first, the lower voice from the left voice box (left ear in stereo headphones); second, the upper voice from the right voice box (right ear); third, the left and right voice together. May 10, 2007. Quabbin Park, Ware, Massachusetts. (1:32)