David Trinks · Unsplash Giant otter
Pteronura brasiliensis
The world's largest otter, living in noisy family groups. They are highly territorial and will confront black caimans to defend their fishing territory.
At a glance
Size 1.0–1.8m; 22–32kg
Diet Fish, caimans, anacondas
Active Dawn (05–07), Day (07–17)
Layer River
How to spot it
Listen for their loud screams and chirps along slow river stretches. Stay back and quiet.
Threats and conservation
Giant otter is listed as Endangered by the IUCN Red List (assessed 2015). This section will include sourced information on threats, population trends and active conservation programmes after expert review.
Watching responsibly
- Keep a safe distance. Do not approach to get a closer look or photograph.
- Look, listen, wait. Passive observation causes the least disturbance.
- Never feed, bait, call to or touch this animal.
- Follow all local park and reserve rules.
- Go with a qualified, locally-licensed guide whenever possible.
Sources
Conservation status: IUCN Red List Red List. Assessment year: 2015. Full sources will be listed here after expert review. Last checked: 2026-10-11.
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