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Glaucomys volans
Don't you just love what flash does to nocturnal rodent eyes? HA! I'd agree most likely to be a southern flying squirrel. Here is a very interesting link to an article about the two flying squirrel species in Pennsylvania: http://tinyurl.com/camcdmb
Great spotting!
I agree that this is a Flying Squirrel. It is most likely a Southern Flying Squirrel: http://en.wikipedia.org/wiki/Glaucomys_v...
Northern Flying Squirrels are also found in a few areas in PA but are much more rare in the state.
http://www.post-gazette.com/stories/spor...