>>I thought I was well-versed on Hyla andersonii, but now I've been told that they have been found in Michigan... several years ago, in fact. True, or just talk? Thanks!

Hyla andersonii is not the Pine Woods treefrog, but the Pine Barrens treefrog. The Pine Woods treefrog is Hyla femoralis. Biochemical and morphological data show that all of the species of Hyla and Pseudacris native to the USA (and the Eurasian species of Hyla) are descended from a single common ancestor that is most likely a member of the Hyla eximia species group. So, many of them do look alike sometimes and misidentification is certainly possible.

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