Their aquatic habitats include streams, rivers, lakes, ponds, and marshes, which can contain both freshwater and saltwater. They want clean water with little human disturbance. Otters are a very adaptable species that can live in both hot and cold climes, as well as at high altitudes and in low-lying coastal waters.
Native to the northern and eastern shores of the North Pacific Ocean, the sea otter is a marine mammal. Although they are among the smallest marine animals, sea otters are the biggest members of the weasel family, often weighing between 14 and 45 kg (30 and 100 lb) as adults. The sea otter has the densest coat of fur in the animal kingdom, making it different from most marine animals in that it uses it as its main means of insulation. The sea otter can live only in the ocean, despite the fact that it can walk on land. The sea otter lives in areas close to the shore, where it forages by diving to the ocean floor. It mostly preys on fish species as well as numerous mollusks, crustaceans, and marine invertebrates like sea urchins. Its eating and foraging behaviors are notable in a number of ways. It is one of the few mammal species that uses tools, using boulders to open shells and remove prey. It is a keystone species over the majority of its range, regulating sea urchin populations that would otherwise cause serious harm to kelp forest ecosystems. Due to the fact that some of its prey species are also prized by humans as food, sea otters and fisheries frequently come into conflict.
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