Key to the Gray Treefrog Group
The Gray Treefrog and Cope's Gray Treefrog are identical in appearance to the eye. In fact, they are quite different. The Gray Treefrog has four sets of chromosomes (tetraploid), while the Cope's Treefrog has the nomal two sets (diploid). While the two species look the same the call of Cope's Treefrog is a much faster trill and the distribution of the two species does not overlap in all areas.
22a. Ontario (east of Lake of the Woods) and provinces east
Hyla versicolor (Gray Treefrog)
22b. west of Lake of the Woods in Ontario
Hyla chrysoscelis (Cope's Gray Treefrog)
Hyla versicolor (Gray Treefrog)
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