A giant otter photographed at Dallas World Aquarium in Texas
A giant otter photographed at Dallas World Aquarium in Texas
Photograph by Joel Sartore, National Geographic Photo Ark

Giant Otter

Common Name:
Giant Otter
Scientific Name:
Pteronura brasiliensis
Type:
Mammals
Diet:
Carnivore
Size:
Up to 6 feet
Weight:
75 pounds
IUCN Red List Status:
Endangered
Current Population Trend:
Decreasing

This South American otter is the world's largest, at some 6 feet long. It lives only in the rivers and creeks of the Amazon, Orinoco, and La Plata river systems.

Aquatic Adaptations

These huge members of the weasel family swim by propelling themselves with their powerful tails and flexing their long bodies. They also have webbed feet, water-repellent fur to keep them dry and warm, and nostrils and ears that close in the water.

Hunting for Fish

Fish make up most of the giant otter's diet. They hunt alone or in groups, sometimes using coordinated efforts, and must be successful often to meet their daily intake quota. Each animal may eat six to nine pounds of food per day. Fish are supplemented by crustaceans, snakes, and other river creatures.

Giant Otter Families

Giant otters live in family groups which include monogamous parents and the offspring from several breeding seasons. They den by burrowing into banks or under fallen logs, and establish a home territory that they will aggressively defend.

Like most other otter species, giant otters come ashore to give birth. Females retreat to their underground dens and deliver litters of one to six young. Young otters remain in the den for a month but grow up quickly. After nine or ten months, it is difficult to tell mother from child.

Giant otters have been hunted extensively and wild populations are at-risk.

This photo was submitted to Your Shot, our photo community on Instagram. Follow us on Instagram at @natgeoyourshot or visit us at natgeo.com/yourshot for the latest submissions and news about the community.
This photo was submitted to Your Shot, our photo community on Instagram. Follow us on Instagram at @natgeoyourshot or visit us at natgeo.com/yourshot for the latest submissions and news about the community.
Photograph by Ernane Junior, National Geographic Your Shot

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