The Gambian pouched rat is the largest known rat species, reaching lengths of up to 3 feet. Their average weight is between 3 and 4 pounds, although they can weigh up to 9 pounds. More »

Rats grow to cover a wide range of sizes; some are minuscule, while others grow up to 3 feet in length. Individual rats of various species are occasionally found at this large size, but one species of giant rat, the Bosa... More » Pets & Animals Mammals Rodents

Sewer rats have a maximum body length of 10 inches, with tails of a similar length. They can weigh up to 2 pounds, but specimens of this size are rare in the wild. Sewer rats go by many names, such as "brown rats," "whar... More »

According to experts, domesticated rats may reach up to 12 inches in length and up to 5 inches in width. However, due to a shorter life expectancy, those found in the wild typically do not live long enough to exceed 10 i... More »

Wolf rats are fictional creatures featured in the 2008 PC role-playing video game Drakensong. In the game, these creatures can be found in sewers, cellars and dungeons. Although solitary wolf rats pose little threat to a... More »

Rex rats are domesticated rats with a particularly curly coat. Both their fur and whiskers are curled, which gives young rex rats an especially woolly appearance. More » Pets & Animals Mammals Rodents

There are many differences between rats and mice, such as their size, behavior and the shape of their snouts. Mice are typically between 4 to 8 inches long, including their tails, with snouts that are triangular in shape... More »