This article relies largely or entirely on a single source. (July 2021)
Enhydra is a genus of mustelid that contains the sea otter and two extinct relatives.
|Sea otter (Enhydra lutris)|
Enhydra reevesi, the oldest known species, has its origins in the Atlantic, suggesting this may have been where sea otters originated. Fossil evidence indicates the Enhydra lineage became isolated in the North Pacific approximately 2 million years ago, giving rise to the now-extinct Enhydra macrodonta and the modern sea otter.