Sitting in an old-growth spruce fir forest, Doug Smith says he can see first-hand the impact of reintroducing wolves on the larger ecosystem of Yellowstone National Park. Long before Yellowstone became the world’s first national park in 1872, wolves thrived in the U.S. Rocky Mountains. But early Yellowstone rangers killed off the last of the park’s wolves by 1926. Then, in 1995, the U.S. government reintroduced wolves to Idaho and Yellowstone using wolves captured in Canada. Smith helped bring them back to the park and was in charge of Yellowstone’s wolf project for nearly 30 years until he retired in 2022. “Yellowstone is a very different place, with and without wolves,” Smith said. “Wolves definitely have changed this landscape with the help of other predators,” he added. “It’s very different.” And one wolf, in particular, fascinated wolf watchers for longer than almost any other.