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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.
Gray squirrels use leaf nests, also known as âdreys,â primarily during the summer months. They build these nests up to 30 feet off the ground in the fork between a tree limb and the treeâs main trunk, well hidden by the summer foliage. The single entrance is concealed, facing the trunk of the tree.