Add Yahoo as a preferred source to see more of our stories on Google. Wolf in Yellowstone National Park. (JudiLen/E+/Getty Images) Biology teachers around the world commonly introduce their students ...

Wolves were eradicated from Yellowstone in the 1920s. With the wolves gone, populations of elk (a large species of deer) grew too large. Elk overgrazed the park's riverbanks, turning groves of willow ...

One of the most celebrated claims about Yellowstone’s wolves is facing a major challenge. Scientists say the study behind the famous trophic cascade story relied on flawed methods that overstated the ...

Despite a continued lull in adding new wolves to the national park’s population, there are no ‘biological red flags’ that ...

Yellowstone Delta Pack wolf. Credit: National Park Service (public domain). Forty-one wild wolves went into Yellowstone National Park in three winters, and in the winter before the first crate opened ...

Yellowstone National Park is often told as a story of recovery. Wolves returned and then elk changed their behavior. Willows and aspens then rebounded and rivers, it is said, changed course. The ...

Learn more about the canine distemper outbreak that could have reduced Yellowstone wolf pup populations to a historic low. Since the reintroduction of gray wolves in Wyoming — both inside and outside ...