The Raoellidae is a family of primitive artiodactyls that are only known from the Eocene epoch of the Indian subcontinent. They were semiaquatic animals that probably lived most of their lives in and around rivers and lakes. Their bones were more dense, similar to that of a modern hippopotamus, which helped them reduce buoyancy underwater. Raoellids were omnivorous, probably feeding on aquatic vegetation and shellfish.