In various places around the world, rewilding can be seen with favorable results.

Years later, scientists realized the damage that had been done by getting rid of one of the park's top predators.

In the 1990s conservationist Dave Foreman, co-founder of Wild Earth magazine, invented the term “rewilding.”

Insects and smaller animals that had gone missing returned. The natural balance had been restored.

Other people, however, believe that rewilding methods can be as basic as planting trees or simply not interfering with the land.

A dramatic increase in the elk population resulted in the destruction of vast amounts of grass and trees.

As a gray wolf lets out a mournful cry into the sky, nearby wolves answer him with high-pitched howls.

It is defined as "a conservation effort focused on restoring sustainable biodiversity and ecosystem health by protecting core wilderness areas."

It was in this increasingly popular conservation strategy that a solution was found.

Ages ago, herds of European bison thundered across Europe.

Thankfully, Europe's largest land mammal survived because of a captive breeding program.

In regions of southern Africa, cheetah and lion restoration programs have proven very successful.