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Gray Tree Frog Calls and Sounds (w/ audio examples)
Tree Frog Sounds and Calls in the United States - Naturalist Guides
Gray treefrog - Wikipedia
Sound of 32 Tree Frog Species in the United States - The Pet …
Calls of Frogs and Toads of the Northeast | Music of Nature
Gray Tree Frog Sounds: A Guide to Their Calls - Naturalist Guides
New York Frog Sounds and Calls - Naturalist Guides
Sounds of North American Frogs - Smithsonian Folkways …
ARMI - Frog and Toad Calls - USGS
The Gray Tree Frog: A Guide to Identification and Care