Chestnut-backed chickadee
Chapter 6: Song Learning Often Creates Complex Songs and Large Repertoires
Subchapter: What? "Songbirds" with no song?
From page 106 in the book.
Photo by Robert Royse
♫453. The tsick-i-see-see call, thin and scratchy, given during the dawn chorus. March 19, 2017. Prefumo Canyon Road, San Luis Obispo, California. (0:50)
♫454. Example 2, with calling Bewick's wren and singing orange-crowned warbler, Wilson's warbler. March 12, 2017. Montaña de Oro State Park, Los Osos, California. (0:59) Recorded by Janet Grenzke.
♫455. Example 3. June 15, 2009. William L. Finley National Wildlife Refuge, Corvallis, Oregon. (0:22)