Sea otter

The sea otter (Enhydra lutris) is a marine mammal native to the coasts of the northern and eastern Pacific Ocean. They are the heaviest species in the weasel family, weighing from between 14 and 45 kg (31 and 99 lb).Unlike most marine mammals, the sea otter's primary form of insulation is a thick coat of fur, the densest in the animal kingdom. Despite it being able to walk on land, they are capable living exclusively in the ocean.