Frogs and their calls ...

Michael Benard
mfbenard -at- gmail dot com
All audio recordings and photographs copyright Michael Benard.
Do not reproduce without permission.
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calling male Gray Treefrog, Hyla versicolor

A Gray Treefrog (Hyla versicolor) photographed while calling in Livingston Co., MI. The call of the gray treefrog is a short trill. In the audio clip below, you can hear the short trills of several gray treefrogs. Also in the background of the clip is the longer call of the American Toad (Bufo americanus)

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The female gray treefrog will select a male based on the quality of his song, and move closer and initiate mating (amplexus). The eggs will hatch, and the the gray treefrog tadpoles will develop for a couple months as tadpoles, before they metamorphose and leave the pond.

The two photos below show the same male Gray Treefrog, and were taken moments apart. The top photo shows him in the middle of his advertisement call; his vocal sac is inflated and you can see ripples in the water caused by his trill vibrating through his body. The bottom photo shows him between calls. There is no disturbance in the water. His vocal sac is still partially inflated, but it is not nearly as full as during his call.

male gray treefrog with extended vocal sac
Male gray treefrog with deflated vocal sac

Frog Photographs

Frog Call Recordings

Information on Gray Treefrogs

All text and photographs Michael F. Benard
For information on using this photograph, contact me via email at:
mfbenard -{at}- gmail dot com