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A sea otter using a rock to break open a shell. The sea otter, Enhydra lutris, is a member of the Mustelidae that is fully aquatic. Sea otters are the smallest of the marine mammals, but they are also the most dexterous. Sea otters are known for their ability to use stones as anvils or hammers to facilitate access to hard-to-reach prey items.
Sea otter conservation began in the early 20th century, when the sea otter was nearly extinct due to large-scale commercial hunting. The sea otter was once abundant in a wide arc across the North Pacific ocean, from northern Japan to Alaska to Mexico. By 1911, hunting for the animal's luxurious fur had reduced the sea otter population to fewer ...
Furthermore, sea otters will use large stones to pry an abalone off its rock; they will hammer the abalone shell with observed rates of 45 blows in 15 seconds or 180 rpm, and do it in two or three dives. Releasing an abalone, which can cling to rock with a force equal to 4,000 times its own body weight, requires multiple dives by the otter. [102]
The sea otter (Enhydra lutris) is a marine mammal native to the coasts of the northern and eastern North Pacific Ocean.Adult sea otters typically weigh between 14 and 45 kg (30 and 100 lb), making them the heaviest members of the weasel family, but among [3] the smallest marine mammals.
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Enhydra is a genus of mustelid that contains the sea otter and two extinct relatives. It is the only extant genus of the bunodont otters group, referring to otters with non-blade carnassials with rounded cusps. [1] Sea otters probably diverged from other otters during the Pliocene, approximately 5 mya. [2]
Retrospective estimates of worldwide sea-otter numbers before the bulk exploitation of these mammals range from 150,000 to 300,000. [42] Sea otters are "slow breeders, only one sometimes two pups being born at a time" each year, which makes the population vulnerable in conditions of intensive hunting. [43] [44]
Otter 841, California's most ornery sea mammal, has returned to waters off Santa Cruz. Authorities warn surfers and swimmers to steer clear of the creature.