Aminals
**Cope's gray treefrog** (*Dryophytes chrysoscelis*) is a species of treefrog found in the United States and Canada. It is almost indistinguishable from the gray treefrog (*Dryophytes versicolor*), and shares much of its geographic range. Both species are variable in color, mottled gray to gray-green, resembling the bark of trees. These are treefrogs of woodland habitats, though they will sometimes travel into more open areas to reach a breeding pond. The only readily noticeable difference between the two species is the mating call — Cope's has a faster-paced and slightly higher-pitched call than D. versicolor. In addition, D. chrysoscelis is reported to be slightly smaller, more arboreal, and more tolerant of dry conditions than D. versicolor.
https://en.wikipedia.org/wiki/Mexican_alligator_lizard