What are a group of sea otter called?
A group of sea otters is called a "raft." This is most likely a reference to the appearance of a group of sea otters: When they do congregate, sea otters often rest closely together, their log-like bodies moored one to the other either by holding paws or by anchoring themselves in the same bed of kelp.
Sea otters are the only species in their genus, Enhydra. However, there are thirteen species of otter in the subfamily Lutrinae; these include the Marine otter, the North-American river otter, the Neotropical river otter, the Southern river otter, the Eurasian otter, the Hairy-nosed otter, the Asian small-clawed otter, the African clawless otter, the Congo clawless otter, the Giant otter, the Smooth-coated otter, the Spotted-necked otter, and (of course) the Sea otter.