Water opossum : See Yapock, and the Note under Opossum.

Example:


Taxonomy
opossums, Water Opossum, Yapok, Chironectes, Subfamily, marsupial, pouch, Chironectes minimus, free encyclopedia, species, aquatic animals, long tail, search, Infraclass, minimus, family Didelphidae, adaptations, swim.

Defination from the web:
Water Opossum (Chironectes minimus), also locally known as the Yapok, is a marsupial of the family Didelphidae. It is the only member of its ... Being a marsupial and at the same time an aquatic animal, the Water Opossum has evolved a way to protect its young while swimming. ...