benny337 // Shutterstock. Beavers. A beaver chewing on a branch in a clear river. Beavers are revered as nature’s civil engineers, a species capable of altering entire ecosystems with the dams ...

Since the species doesn't have any natural predators on the island, it ravaged the ecosystem, causing the extinction of 12 animal species while preying on the native lizards and birds that ...

Stacker compiled a list of 10 animals from diverse environments, outlining how each helps sustain its ecosystem.