A wolf leaves Yellowstone National Park. It follows the scent of elk, crosses an invisible boundary and enters Montana.

The first half of the story is well established. Wolves were eradicated from Yellowstone in the 1920s. With the wolves gone, ...

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 ...

Deep in the heart of Yellowstone National Park, audio recorders roughly the size of hardcover books are documenting wolf barks, elk bugles and bird chirps 24 hours of the day, seven days a week, 365 ...

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 ...

However, this summer the last remaining pack from the reintroduction 31 years ago, called Mollie’s Pack, decided to take a walkabout and left the sanctuary of the national park. The pack consisting of ...

Featuring a foreword by Jane Goodall, beautiful images, a companion online documentary by celebrated filmmaker Bob Landis, and contributions from more than seventy wolf and wildlife conservation ...

Gray wolves know that the best way to survive in this world is together. They live in pack families, relying on each other to hunt hoofed mammals many times their size. A single wolf doesn’t want to ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. North American pronghorn are commonly encountered in Yellowstone National Park, but it's rare to witness these elegant speedsters ...

You might be among the 46 million people who’ve seen a video showing how wolves changed Yellowstone, or you may have heard some other version of this story ...