Black-capped chickadee
Chapter 5: More about Song Learning
Subchapter: Song (and call) dialects
From page 64 in the book.
Photo by John Van de Graaff
♫255. Typical hey-sweetie song that occurs from the Atlantic to the Pacific, from Nova Scotia to British Columbia, and throughout most of mainland North America. All songs are on the same pitch (to learn about songs on different pitches, see p. 155 in the book). Nice ruffed grouse drum beginning at 0:50. May 21, 2015. Blue Mountain Road, Paul Smiths, New York. (1:01)
♫256. One of several Martha's Vineyard dialects off the coast of Massachusetts; this male alternates two different songs during the dawn chorus. May 10, 1994. Aquinnah (formerly Gay Head), Martha's Vineyard, Massachusetts. (0:21)
♫257. An Oregon dialect, in the Willamette Valley west of the Cascade Mountains. This male has three different songs that he bounces among during the dawn chorus. With loud spotted towhee. May 24, 2009. William L. Finley National Wildlife Refuge, Corvallis, Oregon. (5:10)
♫258. For comparison, four songs from each of the above three dialects (12 songs total). (0:39)