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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.
Many ecological arms races between predators and prey can be characterized as burrowing animals versus predators trying to get animals out of their burrows. The most famous burrowing animals are mammals, including rabbits, chipmunks, moles, gophers, and groundhogs. The burrow of a single groundhog occupies 1 cubic meter, while the complex warrens of rabbits may occupy hundreds of cubic meters.