Guinea pig
Guinea pigs are large for rodents; the common pet breeds weigh between when fully grown and measure between in length. Some livestock breeds weigh when full grown. Pet breeds live an average of four to five years, but may live as long as eight years. According to "Guinness World Records", , the longest-lived guinea pig was 14 years, 10 months, and 2 weeks old. Most guinea pigs have fur, but one laboratory breed adopted by some pet owners, the skinny pig, is a mostly furless breed. Some breeds are long-fur breeds such as the Peruvian, the Silkie, and the Texel.