nutria, myocastor, biberratte, coypus, sumpfbiber, nagetier, coypu, schweifbiber, saeugetier, schweifratte, wasserratte, rodentia, stachelschweinverwandte, echimyidae, muelheim, wildlife, nager, nutrias, myocastor coypus, myocastorinae, hystricomorpha, stachelratte