Physical Description
Marine otters are relatively small, and among otters, only the oriental small-clawed otter is smaller. Lengths range from 83 to 113 centimetres (33 to 44 in), not counting the tail of 30 to 36 centimetres (12 to 14 in). Weights can range from 3 to 5.8 kilograms (6.6 to 13 lb). Their fur is dark brown on the back and light brown on belly. The guard hairs cover short insulating fur with a grayish color. The fur is coarser and tougher than in sea otters.
The front and hind paws are webbed, and there are four teats.
The marine otter's lower jaws contain eight pairs of teeth, and the upper jaws eight or nine pairs. The teeth are developed for slicing rather than crushing.
Sexual dimorphism in this species not readily apparent.
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