Of course, the process wasn’t as simple as just bringing a dead dire wolf back to life or just cloning it. Ancient DNA degrades over time, so researchers couldn’t just clone a dire wolf outright.

Rivka Galchen on how new research shows that people got the model of aggression and dominance, derived from wolf-pack behavior, wrong.

The Gibbon wolf pack standing on snow. Photo by Doug Smith/Via National Park Service When wolves were reintroduced in 1995, about 18,000 elk grazed Yellowstone’s northern range, and many aspen ...