Wolf reintroduction to Yellowstone demonstrates how predator restoration benefits entire ecosystems.
The Yellowstone wolf reintroduction is one of the most documented examples of trophic cascade effects — the profound ecosystem changes triggered by restoring an apex predator. Wolves changed elk behavior, reducing overgrazing in riverbanks, which recovered vegetation, stabilized streams, and increased biodiversity. Individual wolf and elk welfare must both be considered: wolves provide a natural life for returning predators while elk face predation pressure that may increase individual suffering but improves population health. The welfare calculus of predator reintroduction is complex but ecologically transformative.