Ruddy duck
Chapter 2: Birds and Their Sounds
Subchapter: Mechanical (non-vocal) sounds
From page 22 in the book.
Photo by Marie Read
♫64. A male ruddy duck in his "bubbling display"; with his bill he beats the air out of his inflated neck feathers, finishing off his display with a low, vocal waaaaaaa. June 9, 2008. Arapaho National Wildlife Refuge, Walden, Colorado. (0:35)