DENDROLOGY

Detailed explanation-1: -Rats are in a group known as rodents. Rodents are gnawing animals that include beavers, mice, and squirrels.

Detailed explanation-2: -: any of an order (Rodentia) of relatively small gnawing mammals (such as a mouse, squirrel, or beaver) that have in both jaws a single pair of incisors with a chisel-shaped edge. : a small mammal (such as a rabbit or a shrew) other than a true rodent. rodent adjective.

Detailed explanation-3: -The gnawing characteristic of rodents is due to their four prominent incisors that project from the front of their mouths, two in the center of the upper jaw and two in the center of the lower one. Their incisors grow throughout the rodent’s entire life, about five inches a year, and are worn down by gnawing.

Detailed explanation-4: -Most people are familiar with mice, rats, hamsters, and guinea pigs, which are commonly kept as pets. The Rodentia also includes beavers, muskrats, porcupines, woodchucks, chipmunks, squirrels, prairie dogs, marmots, chinchillas, voles, lemmings, and many others.