did-you-kno:

Wolves can shape the ecosystem and physical geography of the land they live on. When wolves were reintroduced into Yellowstone National Park in ‘95 after a 70-year absence, trees grew faster, animal populations increased, and rivers even changed their behavior because new vegetation helped reduce erosion. Source Source 2 Source 3

I did know, and it is awesome! You mean..you NEED Apex predators to keep an ecosystem healthy? What a concept!!!