Compressed from .wav format to .mp3 delivery format
J. Willard Marriott Library, University of Utah, Salt Lake City, Utah 84112; Ecological and animal data provided by NatureServe. NatureServe Explorer: An online encyclopedia of life [web application]. NatureServe, Arlington, Virginia. Available http://www.natureserve.org/explorer.
The advertisement calls of two distant male frogs calling at night
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Photo by Jeff Servoss, courtesy of U.S. Fish and Wildlife Service