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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.
Groundhogs burrow into the ground, slipping there, hibernating and rearing young. They can move up to 35 cubic feet of soil when digging their burrows. That, in and of itself, can be destructive, depending upon where they decide to put the burrow. Groundhogs do go into a true hibernation state.