Marsh wren
Chapter 3: Why and How Birds Sing
Subchapter: Singing in the brain
From page 34 in the book.
Western marsh wren Photo by Robert Royse
Eastern marsh wren Photo by Robert Royse
♫107. Songs of the western marsh wren, with their enormous variety, require more brain space than do the more limited repertoires of eastern males. May 22, 2009. South Slough National Estuarine Reserve, Charleston, Oregon. (1:54)
♫108. Songs of the eastern marsh wren, sounding more liquid, more homogeneous, with less variety. June 9, 2012. Parker River National Wildlife Refuge, Newburyport, Massachusetts. (1:30)