The calls and songs of common loons (Gavia immer) are ethereal, beautiful, and "sad." These were recorded on July 11, 2010 at 10:10 P.M. in the region of the Provincial Park of Frontenac, Québec, Canada. The common loon has four distinct calls/songs: tremolo, wail, yodel and hoot.
Loon audio file by Laurent Wermenlinger CC BY-NC-SA 3.0
Photo by John Picken CC BY 2.0