What Happens When Nature Fights Back: 24 Species That Refuse to Go Quietly

7. American Bison

Once numbering in the millions, American bison were nearly wiped out, with only a few hundred remaining by the late 1800s. Through the efforts of indigenous groups and dedicated conservationists, their herds are making a comeback on protected lands and private reserves.
As they return, bison are helping to restore prairies and native grasslands, bringing balance back to these vital ecosystems. Source