|More than 600 species of "tree frogs" occur throughout the world, but only a few of these mostly tropical species occur in North America. Gray tree frogs occur in eastern North America. They have large toe pads, which enable them to climb smooth vertical surfaces such as trees. Individual frog may be gray or green, or shades thereof, depending on its activities and its environment. Dependent on woodland pools and small ponds for breeding, this individual was photographed in the spring while calling (a slow melodic trill) in a small pond in Ann Arbor, Michigan.|
- photographer, Larry Master
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