Wildari Planet
Giant otter lying flat on a wet rocky ledge with sleek dark brown fur, holding a fish tail in its mouth while gazing forward.
South AmericaMammalsEndangered

Giant Otter

Where Giant Otters Live

Continent: South America

Slow-moving rivers, oxbow lakes, and flooded wetlands of the Amazon and Orinoco river systems — found in all South American countries except Chile, Argentina, and Uruguay.

The Giant Otter is the world's longest otter, reaching up to 1.8 meters, and one of the most social carnivores on Earth. Living in tight family groups that fish cooperatively, defend territory together, and raise cubs as a team, they are extraordinarily vocal - with a repertoire of over 22 distinct sounds. Their dense, velvety fur, which nearly drove them to extinction through hunting, is so thick that water barely reaches their skin.

The silhouette of South America map on the white background.

South America

Quick Facts

Length icon
Lengthup to 1.8 m
Weight icon
Weight22-32 kg
Lifespan icon
Lifespan8-10 years
Diet icon
DietFish and caimans
Group size icon
Group size3-8 family members
Sounds icon
Sounds22+ distinct vocalizations
Population icon
Population2,000-5,000
Threats icon
ThreatsMercury, mining, habitat loss

Conservation Status

EXExtinct
EWExtinct in the Wild
CRCritically Endangered
ENEndangered
VUVulnerable
NTNear Threatened
LCLeast Concern
NENot Evaluated

How Giant Otters Survive in the Wild

A giant otter with wet fur and distinct neck markings partially submerged in greenish water, surrounded by gentle ripples.
1

Poison in the River

Mercury used in illegal gold mining washes into rivers and builds up through the food chain. Small organisms absorb it first, then fish accumulate higher levels as they feed. 

Giant otters, which rely heavily on fish, end up ingesting dangerous amounts. Mercury poisoning can damage their nervous system, reduce reproductive success, and weaken overall health. 

This contamination threatens otters across parts of the Amazon and undermines conservation work aimed at protecting the species.

1 / 3

Social Lives of Giant Otters

Two giant otters in shallow water, one lying on its back with its mouth open while the other leans in closely, surrounded by a muddy riverbank and vegetation.
1

A Family-Run Operation

Giant otter groups are led by a dominant breeding pair. The rest of the family is usually made up of their offspring from previous litters. 

This structure creates a stable social unit that cooperates in hunting, territory defense, and raising young. 

The breeding pair guides group movement and maintains order, while older offspring help with daily tasks.

1 / 3

Photo Gallery

A giant otter partially submerged in water holding a fish and biting into it, with warm golden light reflecting off the rippling surface.A baby otter with wet brown fur and small dark eyes resting on a light surface, its tiny paws visible in the foreground.Two giant otters in the water near a leafy riverbank, one actively eating a fish while the other watches nearby.A giant otter lying on a dry, earthy surface with scattered plant material, showing its sleek brown coat and lighter throat markings.Four otters standing close together on a moss-covered rock, their wet brown fur and alert expressions highlighted by surrounding green vegetation.A single otter swimming with its head above greenish water, showing wet fur, round eyes, a pinkish nose, and long whiskers. A giant otter standing among tall green grass, displaying dark brown fur and cream-colored throat markings against a blurred natural background.An adult sea otter floating on calm blue water while holding a fluffy lighter-colored pup close, their faces touching gently.An otter lying on a wet rock while holding a smooth round stone between its paws, its damp fur visible against the moist surface.A giant otter with wet fur and distinct neck markings partially submerged in greenish water, surrounded by gentle ripples.A giant otter in the water gripping a fish in its mouth, with splashes around it and tall green grass lining the background.Two giant otters in shallow water near a muddy riverbank, one lying partly on a rock with its mouth open while the other grips its face or neck, capturing a tense or playful interaction in their natural habitat.Three giant otters with dark wet fur and pale throat patches gather at the edge of a river, with one resting on a submerged log while the other two emerge from the water below.

Flashcards