Any carnivorous animal of the genus Lutra, and related
   genera. Several species are described. They have large, flattish heads,
   short ears, and webbed toes. They are aquatic, and feed on fish. Their
   fur is soft and valuable. The common otter of Europe is Lutra vulgaris;
   the American otter is L. Canadensis; other species inhabit South
   America and Asia.