COYPU  , the native name of a large

South American aquatic rodent mammal, known very generally among European residents in the country as nutria (the Spanish word for otter) and scientifically as Myocastor (or Myopotamus) coypu . Its large size, aquatic habits, partially webbed hind-toes, and the smooth, broad, orange-coloured incisors, are sufficient to distinguish this rodent from the other members of the family Capromyidae . Coypu are abundant in the fresh waters of South America, even small ponds being often tenanted by one or more pairs . Should the water dry up, the coypu seek fresh homes . Although subsisting to a considerable extent on aquatic plants, these rodents frequently come ashore to feed, especially in the evening . Several young are produced at a birth, which are carried on their mother's back when swimming . The fur is of some commercial value, although rather stiff and harsh; its colour being reddish-brown .