Cope's Gray Tree Frog

Hyla versicolor, the Gray Treefrog, is very similar in apearance to Cope's Gray Treefrog and both can change color between green and gray. Cope's tends to have smoother skin, but this not always reliable. The big difference is that the Cope's Gray Treefrog has a diploid complement of chromosomes and the Gray Treefrog is tetraploid so blood tests and chromosome analysis can distinguish the two although this technique is not available to the average person.