RODENT, a member of the order Rodentia, is one of a large group of mammals characterized by 2 pairs of sharp incisors specialized for gnawing. These teeth grow continuously and self-sharpen as they are used. Rodents range in size from tiny mice that weigh 10 grams to the largest species, the BEAVER, which grows up to 35 kg. The deer mouse (Peromyscus maniculatus) and Townsend's vole (Microtus townsendi), 2 of the smallest species, are important prey for a wide range of predators, including...

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