Wood thrush
Chapter 7: When to Sing, and How
Subchapter: How birds go to roost and awake: Going to roost
From page 109 in the book.
♫458. Call notes of two wood thrushes going to roost, with soft tuts, sharper whits, and an occasional incomplete song as well, the interaction between these two birds surging and fading until all is quiet in the forest. May 21, 2010. Tye River Gap, Blue Ridge Parkway, Virginia. (4:52)