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Tamiasciurus hudsonicus
Red squirrels can be easily identified from other North American tree squirrels by their smaller size, territorial behavior and reddish fur with a white venter (underbelly). Red squirrels are somewhat larger than chipmunks.
American red squirrels are widely distributed across North America. Their range includes most of Canada and east of the Rocky Mountains in the United States. I saw this one at Trustom Pond
Thanks ForestDragon for the ID!