An Aleut legend has sea otters coming from the result of a brother and sister falling in love and jumping into the ocean as a result of their difficulties. - The Legend of the Otter, - The almost human behavior of the sea otter is explained in Aleut mythology by the human origin of this animal. From village to village, there are different versions of the legend, which is reported by a number of authors (Choris, Golder, Heizer or Petroff) and which was repeated to me as well during my stay in 1971; but the principal theme remains the same: the first otters were born when a man and woman who had been involved in an incestuous relationship threw themselves into the sea. - According to some versions, a brother takes advantage of his sister under cover of darkness. When, by means of a trick, she learns her lover's identity, she leads him to the top of a cliff, from which they leap into the sea. Where they fall, their parents, who had set out in pursuit, see two otters appear. - In other versions, a husband discovers the liaison between his wife and nephew (or between his wife and brother-in-law). The husband invites his rival to a feast, during which he cuts off his head before his wife's eyes. The woman then takes her lover's head and throws herself off a cliff into the sea. In the very spot where the "offending couple" vanish, the husband sees two sea otters appear. http://www.arctickayaks.com/PDF/Robert-Lamblin1980/robert-lamblin.htm
An otter is any of 13 living species of semiaquatic (or in the case of the sea otter, aquatic) mammals that feed on fish and shellfish, and also other invertebrates, amphibians, birds and small mammals. Otters are very active, chasing prey in the water or searching the beds of rivers, lakes or the seas. Most species live beside water, but river otters usually enter it only to hunt or travel, otherwise spending much of their time on land to avoid their fur becoming waterlogged. Sea otters are highly aquatic and live in the ocean for most of their lives. They are playful animals and appear to engage in various behaviors for sheer enjoyment. Different species vary in their social structure, with some being largely solitary, while others live in groups – in a few species these groups may be fairly large.