Name: Sara C.
How would I sex a grey treefrog (Hyla versicolor)?
"The male is somewhat smaller than the female and during the breeding season ... is distinguished ...
by the presence of the discolored vocal patch. In the male a process of the pad at the base of the
thumb extends onto the upper surface of the thumb, whereas in the female this pad is restricted to the
ventral and inner side of the thumb." Smith, The Amphibians and Reptiles
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Update: June 2012