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 »

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Depending on the size class and strain the dog belongs to, a rat terrier can grow up to 19 inches at the shoulder and weigh up to 40 pounds. The AKC breed standard for show dogs requires them to be under 18 inches in hei... More »

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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 »

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 »

Depending on species, lineage, and whether or not they are captive, rats live between one and four years. The average pet rat lives two or three years, while wild rats rarely live past one year. Pet rats from certain lin... More »

Trench rats were a huge problem during World War I. During this time, they infested every trench line in the war from the eastern to western fronts. The rats carried diseases that weakened and killed soldiers in the tren... More »