Calling Gray Treefrog

calling male Gray Treefrog, Hyla versicolor

The call of the gray treefrog (Hyla versicolor) 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)

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.

I liked this photo so much that I turned it into coloring page that you can print out and color in with your kids. You can find a printable copy on my coloring pages site.

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

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

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Some more pages on herps and natural history:
Pacific Chorus Frog Natural History Snake Image Gallery Spotted Salamander Button
Leech eats frog eggs Coloring page of snakes Frog Calling Video Button
Water Bug Eating Frog Button Kingsnake eating a garter snake Snake eats frog