What about
wolves?
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In Yellowstone national park The the wolves who were absent for 70 years arrived and regenerated the forests allowing vegetation to recover,they transformed the ecosystem and physical geography and changed deer behavior.Because of the wolves heights of trees increased, and animal population increased.
https://www.youtube.com/watch?v=ysa5OBhXz-Q
Animals
The alpine grasses and flowers provide food for elk,deer,mountain lions, coyotes, red foxes, squirrels, chipmunks and many other animals.