Aspects of this topic are discussed in the following places at Britannica.
...The North American gray squirrel (Sciurus carolinensis) has adapted to urban and suburban areas where it is regarded as aesthetic or as a minor annoyance. In northern Europe the red squirrel (S. vulgaris) is valued for its soft, thick fur. Villagers in tropical forests keep squirrels as pets. Most species are hunted for food.
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