Guinea pigs are small, social rodents native to the Andes mountains in South America. They typically weigh between 1.5 to 2.5 pounds and have a lifespan of 4 to 6 years. These animals are known for their friendly nature and make popular pets due to their gentle temperament. Guinea pigs are herbivores, primarily eating hay, fresh vegetables, and specially formulated pellets. They require a spacious cage with proper ventilation and enrichment to keep them happy and healthy. Regular social interaction is essential, as they thrive in groups and can become lonely if kept alone.