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Rodent of the family Sciuridae. Squirrels are found worldwide except for Australia, Madagascar, and polar regions. Some are tree dwellers; these generally have bushy tails, and some, with membranes between their legs, are called
flying squirrels. Others are terrestrial, generally burrowing forms called ground squirrels; these include chipmunks, gophers, marmots, and prairie dogs.
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