Here's a breakdown of their classification:
* Kingdom: Animalia (animals)
* Phylum: Chordata (animals with a backbone)
* Class: Mammalia (mammals)
* Order: Rodentia (rodents)
* Family: Sciuridae (squirrel family)
This means that squirrels are mammals, which are warm-blooded animals that have fur, give birth to live young, and nurse their offspring. They are also rodents, a group of mammals characterized by their large, constantly growing incisor teeth.