All rodents have four incisor teeth that keep growing and must be ground off by gnawing on hard objects like nuts. Squirrels store food. Ground squirrels and chipmunks carry it in pouches inside their cheeks, back to their burrows for storage. Tree squirrels bury nuts and seeds in the ground, for later eating. Their keen sense of smell helps them find the buried food.
Squirrels can be very noisy.
They chatter, chirp, bark, growl, squeak, and squeal. Most squirrels mate in early spring, after much fighting and chasing. Blind, hairless ' and helpless, they depend on the mother's milk for food. In about six weeks they emerge from the nest, fully furred, bright-eyed, and half the size of the adults. Baby squirrels are playful and pester the adults.