Hydrochoerus is a genus of large rodents, commonly known as capybaras. They are native to South America and are the largest living rodents in the world. Capybaras are semi-aquatic animals, often found near rivers, lakes, and wetlands. They have a social structure, living in groups that can range from 10 to 20 individuals. These animals have a distinctive appearance, with a robust body, short legs, and a large head. Their fur is coarse and brownish, providing camouflage in their natural habitat. Capybaras are herbivores, primarily feeding on grasses and aquatic plants, and they play a significant role in their ecosystem by maintaining vegetation.