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Guinea pig, (Cavia porcellus), a tamed types of South American rat having a place with the cavy family (Caviidae). It looks like different cavies in having a hearty body with short appendages, enormous head and eyes, and short ears. The feet have smooth bottoms and short sharp hooks. There are four toes on the forefeet and three on the rear feet. A few types of tamed guinea pigs exist, which are some of the time assembled by coat surface and hair length. The term guinea pig is likewise utilized casually to allude to an individual who fills in as a guinea pig in an investigation. Among rodents, residential guinea pigs are genuinely huge, gauging 500 to 1,500 grams (about 1 to 3 pounds) and having a body 20 to 40 cm (8 to 16 inches) in length.