An otter is any of 13 living species of semiaquatic mammals that feed on fish and shellfish, and also other invertebrates, amphibians, birds and small mammals.
The otter subfamily Lutrinae forms part of the family Mustelidae, which also includes weasels, badgers, wolverines, and polecats.
Otters have long, slim bodies and relatively short limbs, with webbed paws. Most have sharp claws on their feet, and all except the sea otter have long, muscular tails. The 13 species range in adult size from 0.6 to 1.8 metres (2 to 6 ft) in length and 1 to 45 kilograms in weight. The Oriental small-clawed otter is the smallest otter species and the giant otter and sea otter are the largest. They have very soft, insulated underfur, which is protected by an outer layer of long guard hair. This traps a layer of air, and keeps them dry and warm under water
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