How Did Just 20 Beavers Lead to Over 200,000 Dams?

Argentina released just 20 beavers in 1946 to build a fur industry. Decades later, researchers mapped more than 200,000 beaver dams across the Tierra del Fuego archipelago. The business failed to deliver the hoped-for success. The beavers flourished. They spread across Argentina and Chile, cutting trees, blocking streams, and flooding native forests. They didn’t have to chew through every trunk—the rising water could kill trees still standing. This documentary explores how a small introduction became a regional ecological crisis, why removing beavers doesn’t automatically bring forests back, and what conservation teams are learning about restoring the landscapes they changed. The 200,000 figure refers to mapped dams, not individual beavers or necessarily active colonies. Subscribe to Nature’s Plot Twist for true stories about wildlife, science, and human decisions with unexpected consequences. #Beavers #TierraDelFuego #InvasiveSpecies #Argentina #Patagonia #WildlifeDocumentary #ForestRestoration #NaturesPlotTwist