The coypu, also known as the river-rat or nutria is a semi-aquatic rodent originally native to South America, but which has since have been introduced to North America, Europe, Asia, and Africa as well. They were mainly introduced in these countries to be bread for their fur, but their destructive feeding and burrowing habits have transformed the nutria into an invasive species.
The nutria, also known as the river rat, or coypu, is a large, omnivorous, semiaquatic rodent and the only member of the family Myocastoridae. It lives near stretches of water and feeds on stems of river plants. It was originally native to subtropical and temperate South America, but has been also introduced to North America, Europe, Asia, and Africa, mostly by fur ranchers. Even though it is still valued for its fur, it is also considered a pest due to its destructive feeding and burrowing behaviour.