Reintroducing wolves to the park helped keep the prey population under control. If herbivores overpopulated the park, then it would throw the entire ecosystem out of balance. There would be hardly any grass and animals would start dying.
Reintroducing wolves can keep the ecosystem healthy and balanced. They can keep check on deer and elk population which can benefit other plant and animal species.
They increases the biodiversity of plants, birds and animal species by controlling the prey population.
Also the end to overgrazing by herbivores can stabilize rivers and waterbodies.
