Squirrels belong to family Sciuridae of small or medium-size rodents. The family includes tree squirrels, ground squirrels, chipmunks, marmots, flying squirrels, and prairie dogs. Squirrels are indigenous to the Americas, Eurasia, and Africa, and have been introduced to Australia. The earliest known squirrels date from the Eocene and are most closely related to the mountain beaver and to the dormouse among living rodent families.
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