When legislation was passed in the late 1980s requiring gill net fisheries to move farther off shore, the sea otter population began to grow again until the mid-1990s. The sea otters have a flexible skeleton and their face is small and round. Sea otters spend a majority of their day eating, sleeping, and grooming. The 2017 USGS southern sea otter survey results showed the raw count population size dropped to 2,688 an over 25 percent decline from last year. Information and Media Sources: Description. Northern sea otters, from Washington to Alaska, more commonly prey on … The southern river otter (Lontra provocax) is a species of otter that lives in Chile and Argentina.Although called a "river otter", it inhabits both marine and freshwater environments. About 1,000 sea otters died over a 10-year period due to entrapment in gill nets. Their measurements vary depending on the sex. Also known as the California sea otter, the southern sea otter, Enhydra lutris nereis, is a marine mammal of the family Mustelidae, which includes land mammals such as skunks, badgers, and ferrets. Southern sea otter pup Langly was orphaned when her mother received a fatal bite from a great white shark. The southern sea otter also spends a lot of their time in estuaries. A southern sea otter in it's habitat with one of the many other organisms living near it. Luckily, her mother was able to get Langly safely to shore where our trained responders were able to rescue her. Main Characteristics Of The Sea Otters Anatomy. It sometimes is considered a subspecies of Lontra canadensis.The southern river otter is listed as endangered, due to illegal hunting, water pollution, and habitat loss While sea otters have limited mobility on land they will typically spend their whole life in the water. Sprout, a sea otter pup suffering from domoic acid toxicity, came to our hospital not long after Langly arrived. Southern sea otters off Central California prey largely on invertebrates, such as urchins, crabs, abalone, and clams. An estuary is the mouth of the river and where the tide meets the stream. The sea otter weighs up to 80 lb (36 kg) and at maturity is more than 4 ft (1.2 m) long from its nose to the tip of its tail. The 2016 survey recorded a raw count population size of 3,615, the highest survey result ever. The southern sea otter (Enhydra lutris nereis) is the heaviest member of the weasel family and the second smallest marine mammal. Adult males weight between 22 and 45 kilograms and measure from 1.2 to 1.5 meters.On the other hand the adult females usually weigh between 14 and 33 kilograms, and their length varies from 1 to 1.4 meters.. In 1977, the southern sea otter was listed as “threatened” under the Endangered Species Act. 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