Volunteers listen for chorus frogs, spring peepers, northern leopard frogs, American Toads and Eastern gray treefrogs. 

To identify them, listen for these sounds: The chorus frog sounds like running your finger over a fine-tooth comb; the spring peeper sounds like the "peep" of a baby bird; the northern leopard frog, like a rubbery, creaky door on a haunted house or a "long, rubbery snore with occasional chuckles"; the American toad, like a "long, musical trill," the gray treefrog a more "relaxed, laidback, musical, short trill." These frogs all call in the early spring, in April. 

Courtesy of the Iowa Department of Natural Resources. 

Volunteers listen for chorus frogs, spring peepers, northern leopard frogs, American Toads and Eastern gray treefrogs.&nbsp;
To identify them, listen for these sounds: The chorus frog sounds like&nbsp;running your finger over a fine-tooth comb; the spring peeper sounds like the "peep" of a baby bird; the northern leopard frog, like a rubbery,&nbsp;creaky door on a haunted house or a "long, rubbery snore with occasional chuckles"; the American toad, like a "long, musical trill," the gray treefrog a more "relaxed, laidback, musical, short trill." These frogs all call in the early spring, in April.&nbsp;
Courtesy of the Iowa Department of Natural Resources.&nbsp;

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