The elks in Yellowstone Park were spending too much time browsing on willow trees. When the wolves came back, they started chasing them around and away from the trees, which had positive consequences for other species.

Question

Answer

Pro: With the return of willow trees, the beaver population was able to survive and thrive.

Answer

Con: Many willow trees have still not returned in some areas of the park.

Could the de-extinction of certain species help the environment?

The elks in Yellowstone Park were spending too much time browsing on willow trees. When the wolves came back, they started chasing them around and away from the trees, which had positive consequences for other species.

Pros

Cons

With the return of willow trees, the beaver population was able to survive and thrive.

Many willow trees have still not returned in some areas of the park.

Selected claim, supporting its parent

The elks in Yellowstone Park were spending too much time browsing on willow trees. When the wolves came back, they started chasing them around and away from the trees, which had positive consequences for other species.

Pro claim 1

With the return of willow trees, the beaver population was able to survive and thrive.

Con claim 1

Many willow trees have still not returned in some areas of the park.