| Cope's
gray treefrog, or lesser gray treefrog, is sometimes confused with
the bird-voiced treefrog. One can tell them apart by the orange
color on the concealed portion of the leg of the Cope's gray treefrog
as opposed to the green or yellowish-white on the bird-voiced treefrog's
leg. The color of the Cope's gray treefrog can also change from
green or brown to almost white, depending upon changes in temperature
and activity. This species of the gray treefrog can be distinguished
from the common gray treefrog (Hyla versicolor) by its faster,
higher-pitched trill.
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