They didn’t bring in machines or chemicals—just horses. When France faced an ecological collapse across its lowland forests and wetlands, experts took a bold, almost unbelievable step: they released herds of wild-looking horses into the wild. No fences. No caretakers. Just hooves, teeth, and instinct. Many biologists were skeptical. Could animals really fix what decades of human neglect had broken? But what happened next stunned even the harshest critics. And when biologists finally reviewed the footage and data, they were left with one reaction: It’s done.

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