Rodents are relatively small animals that have a single pair of constantly growing incisor teeth specialized for gnawing. Because the incisors are enameled on the front only, the working of upper teeth against lower ones wears away the softer inner surfaces more rapidly, producing a sharp, beveled edge ideal for gnawing. Incisors grow throughout the animals life (if they didn"t they would be worn away), and rodents must gnaw enough to keep them from growing too long.
Rodents have bulbous eyes on the sides of the head, which enable them to see forward or behind, detecting danger over a wide arc. Most, bu not all, have four toes on their forefeet and five on their hindfeet. Most rodents are nocturnal and remain active throughout the year.
Squirrels - Family Sciuridae
Beavers - Family Castoridae
Pocket Gophers - Family Geomyidae
Jumping Mice and Jerboas - Family Dipodidae
Rats and Mice - Family Muridae
Nutrias - Family Myocastoridae