Caviidae is a family of rodents that includes animals commonly known as guinea pigs and capybaras. These mammals are native to South America and are known for their social behavior and herbivorous diet, primarily feeding on grasses and other vegetation. Caviidae members vary in size, with the capybara being the largest rodent in the world. The family Caviidae is divided into several genera, including Cavia for guinea pigs and Hydrochoerus for capybaras. They typically inhabit grasslands, forests, and wetlands, and are often found in groups. Their adaptations, such as strong teeth for gnawing, help them thrive in their environments.