Coypu (Myopotamys coypu), a large rodent in the porcupine section of the order. It is the only known species of its genus, is common in South America on both sides of the Andes, lives (in pairs) in burrows near water, and feeds on aquatic plants. The animal measures from one to two feet in length, not including the long scaly tail; the general colour is brown varying towards yellow; the hind-feet are webbed and enable the coypu to swim well. The mother-animal swims with her young on her back, and this habit may have something to do, it is suggested, with the peculiar position of the teats, which are high up on the flanks. The coypu is much hunted for its flesh and fur. The latter is best known under the
Spanish name of Nutria, and forms an important article of commerce.