Gray Wolves Reintroduced to Yellowstone Revived a Dying Ecosystem
By the mid-20th century, Yellowstone National Park was in a state of disrepair. The ecosystem had been thrown out of whack after it was overrun with elk. The elk took ...
By the mid-20th century, Yellowstone National Park was in a state of disrepair. The ecosystem had been thrown out of whack after it was overrun with elk. The elk took ...