
Giant Otter and 39 Other Migratory Species Win Historic Cross-Border Protection at UN Summit
From the rivers of the Amazon to the skies above the Arctic, 40 vulnerable species gain new international safeguards under the Convention on Migratory Species
The giant otter — South America's magnificent "river wolf," hunted to the brink of extinction for its velvety fur — has just been granted formal international protection under the United Nations' Convention on Migratory Species.
The charismatic predator was among 40 species to receive new or enhanced safeguards at CMS COP15, held in Campo Grande, Brazil, from 23 to 29 March 2026. Representatives from more than 130 governments adopted a sweeping package of conservation measures covering creatures of the seas, skies, and rivers.
Once widespread across South America's river systems, the giant otter (Pteronura brasiliensis) was decimated by decades of fur hunting, peaking in the 1950s and 1960s. At up to 1.8 metres long, it is the largest member of the weasel family and among the most endangered mammals in the Neotropics, with wild populations estimated at fewer than 5,000.
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