Purple martin
Chapter 7: When to Sing, and How
Subchapter: Night singing
From page 126 in the book.
Photo by Brian E. Small
♫514. The general hubbub of martins swirling about their nesting condo. May 10, 2012. Land Between the Lakes, Kentucky. (9:42)
♫515. In the dark, two to three hours before sunrise, older males sing high overhead, apparently in an attempt to attract yearling birds to the nesting colony. May 25, 2004. Ferne Clyffe State Park, Goreville, Illinois. (2:53)