Marine Otter - Oceana

Marine Mammals

Marine Otter

Lontra Felina


Coastal Peru, Chile, and Argentina


Rocky shores

Feeding Habits

Foraging predator


Order Carnivora (carnivorans), Family Mustelidae (weasels and relatives)


Marine otters are foraging predators that eat a wide variety of prey. While they prefer invertebrates, including crabs, clams, and other hard-shelled groups, they are also known to eat some fishes, juvenile birds, and even other mammals. They also scavenge for garbage, bringing them into close contact with people. Unlike many species of weasels, scientists believe the marine otter to be monogamous. Mating, birth, and nursing take place onshore, in protected dens. Adult marine otters are quite small. They only reach about 13 pounds (6 kg) vs. 100 pounds (45 kg) in sea otters.

Unlike most marine mammals that rely on a thick layer of blubber to insulate them from cold ocean waters, marine otters rely on their extremely thick fur. Unfortunately, their fur also nearly led to this species’ demise. Excessive hunting reduced the numbers of marine otters significantly and now the species is endangered (highly vulnerable to extinction). The geographic range is also constricted compared to pre-hunting times, and it may still disappear from some places, as poaching continues to be a problem. Though the marine otter has complete or partial legal protection throughout its range, it continues to show decreasing populations. Without continuing conservation measures and legal protection, this charismatic species could be at risk of being lost forever.

Engage Youth with Sailors for the Sea

Oceana joined forces with Sailors for the Sea, an ocean conservation organization dedicated to educating and engaging the world’s boating community. Sailors for the Sea developed the KELP (Kids Environmental Lesson Plans) program to create the next generation of ocean stewards. Click here or below to download hands-on marine science activities for kids.

Kids Environmental Lesson Plans

Additional Resources:

IUCN Red List