The giant otter, nicknamed the ‘river wolf’, is one of South America’s top freshwater predators. It was hunted to near extinction for its velvety fur until trade bans in the 1970s, and populations have partly recovered in protected areas.
Interesting facts
- The giant otter is the longest member of the weasel family.
- Family groups can number up to about 20 and hunt and defend territory together.
- Family groups have been seen mobbing and driving off caimans, and even jaguars.
- Giant otters are very vocal, using a wide range of calls including screams and hums.
- An adult can eat around 3–4 kg of fish a day.
- Tens of thousands of pelts were exported from Brazil in the mid-twentieth century.
Behaviour
Giant otters live in family groups led by a dominant breeding pair. They build dens in riverbanks and maintain latrines and scent sites along their territory. They are active by day.
Breeding and young
The breeding pair produces 1 to 5 cubs a year, which are raised by the whole family.
Threats and conservation
Habitat loss, mercury pollution from gold mining, overfishing, dams and conflict with fishers.
Where to see it
- Pantanal, Brazil
- Manu National Park and Tambopata, Peru
- Rupununi, Guyana
- Yasuní, Ecuador
Status source: IUCN Red List. Profile last reviewed September 2026.
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