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London Underground station flooding has reportedly been reduced by around 90% thanks to a group of engineers: beavers. After conservationists reintroduced a family of beavers into a nearby city park, the animals built dams and restored wetlands that now absorb and slow floodwater naturally. Authorities had planned major man-made flood infrastructure, but the beavers effectively created their own system — while also boosting biodiversity and restoring the ecosystem around them.