Guinea pigs are short, stocky rodent often kept as pet. They have large heads, small ears, short legs, and a small, plump body. These small, furry animals were domesticated by South American people in the 1950’s.
An adult guinea pig is about 6 to 10 inches long and weighs about two to three pounds. Guinea pigs are not really pigs, they are rodents. Guinea pigs in the wilds usually live in small group of between 10 to 15 animals.
Unlike guinea pigs that are bred by people, most of them live in their natural surroundings have long, coarse, brown or gray fur.
Source: Guinea Pig