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Often there is more than one opening in a burrow system. Ground squirrels live in colonies that can include several dozen animals in a complex of burrows. More than one squirrel can live in a burrow. Ground squirrels are active during the day, mainly from midmorning through late afternoon, especially on warm, sunny days. Ground squirrels have two periods of dormancy during the year.
Ground squirrels do hibernate, but instead of making a nest in a tree somewhere, a ground squirrel will simply go into their den underground and hibernate for five to six months out of the year.