Groundhog Day may be the one day of the year that you give the Marmota monax much thought. For example, did you know that a young groundhog is sometimes called a chuckling? How about that the groundhog is a rodent in the ground squirrel family? Show us your Punxsutawney genius by identifying the groundhogs in the following pictures from the New York Public Library Digital Collection. And rejoice: the entire collection of "Viviparous Quadrupeds of North America" images is now public domain!

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