What field mark helps distinguish the Green Treefrog from a greenish Gray Treefrog?
Answer
A distinct pale or white line running along their sides from the upper jaw to the groin
Green Treefrogs typically sport a distinct pale or white line running along their sides, stretching from their upper jaw down to their groin, which is absent or indistinct on Gray Treefrogs.

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Gray Treefrog - YouTube
Gray Treefrogs - AskMDC - YouTube
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