House sparrow
Chapter 6: Song Learning Often Creates Complex Songs and Large Repertoires
Subchapter: Song complexity
From page 80 in the book.
Photo by Brian E. Small
♫363. Chirrup, chirrup, chirrup . . . on the farm, with cattle nearby—a rather tame singing performance, it seems, energetic but with so little variety. June 10, 2012. Hatfield, Massachusetts. (7:22)
♫364. A portion of the above (♫363) slowed to half speed, revealing to our ears that all songs are the same. (1:03)
♫365. A more versatile performance, with a far greater variety of songs. May 31, 2010. Lincoln Homestead State Park, Springfield, Illinois. (2:36)
♫366. The above (♫365) slowed to half speed. (5:12)
♫367. Calls of nestling house sparrows are surprisingly song-like. June 1, 2017. Hatfield, Massachusetts. (1:40)
♫368. A portion of the above (♫367) slowed to half speed. (0:18)