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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.
Sometimes groundhogs have a summer burrow that is distinct from the burrow used for hibernation, mating and rearing of young. Such a summer burrow would most likely be located in the middle of a grassy area. Meanwhile, the burrow used during winter and spring would be located in a wooded or brushy area nearby.