Genus Myocastor, also known as the coypu or nutria, is a semi-aquatic rodent native to South America. The animal has a distinctive features, such as webbed feet, large orange teeth, and dense fur. There are a few synonyms you might come across when discussing this species. These include nutria rat, river rat, swamp beaver, and Argentine beaver. Depending on the region or context, different synonyms may be used. However, regardless of the name used, the coypu plays an important role in its ecosystem by maintaining wetlands and serving as a food source for native predators.