What's the name of the little gray animal that likes to climb up and down trees? Like a mouse, its tail can be tilted up.

Squirrel, a family of mammals and rodents, including Squirrel Family and African Ground Squirrel Family, is characterized by its hairy tail. Animals closely related to other animals are also collectively called Dendrolimus. Squirrels are generally small and herbivorous, and their food is mainly seeds and nuts. Some species will feed on insects and vegetables, and some tropical species will migrate to prey on insects. Squirrels are native to Northeast China, Northwest China and Europe, and are distributed in other parts of the world except Oceania and Antarctica.