Word Study
coypu
CIDE DICTIONARY
coypu, n. [Native name.].
A South American rodent (Myopotamus coypus ), allied to the beaver. It produces a valuable fur called nutria . [1913 Webster]
OXFORD DICTIONARY
coypu, n. (pl. coypus) an aquatic beaver-like rodent, Myocastor coypus, native to S. America and kept in captivity for its fur.
Etymology
Araucan
For further exploring for "coypu" in Webster Dictionary Online