A guinea pig is a small, domesticated rodent that belongs to the family Caviidae. They are native to the Andes mountains in South America and are popular pets due to their friendly nature. Guinea pigs typically weigh between 1.5 to 2.5 pounds and have a lifespan of about 4 to 6 years. They come in various breeds, each with different fur types and colors. These animals are social creatures and thrive in pairs or groups. Guinea pigs require a balanced diet that includes hay, fresh vegetables, and specially formulated pellets. They are known for their vocalizations, which include squeaks and purrs, expressing their emotions and needs.