Red crossbill
Chapter 5: More about Song Learning
Subchapter: Song (and call) dialects
From page 72 in the book.
Photo by Laure Wilson Neish
♫333. Dialect 1, a spring flock in the Tetons. May 31, 2009. Grand Teton National Park, Jackson, Wyoming. (0:56)
♫334. Dialect 2, a different red crossbill species from New England? With calling siskins and jays, and enthusiastic birders. February 15, 2012. Marsh-Billings-Rockefeller National Historic Park, Woodstock, Vermont. (0:59)