Rodents are mammals. All mammals are warm-blooded. This means that their body temperature stays the same in cold and warm temperatures. Female mammals make milk in their bodies to feed their babies. Humans are mammals too. Mammals are vertebrates. This means that they have a backbone and a skeleton inside their body.

Rodents are covered with fur. They have teeth called incisors that never stop growing. They need to grind their teeth together or chew and gnaw on things to keep their teeth from growing into their skull!