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

Formed during the first reintroduction, Yellowstone's oldest wolf pack ventured out of the park this summer sparking fears for their safety from hunters.

There is a trail camera strapped to a tree deep in the Sunlight Basin of northwest Wyoming, and it holds footage that has rattled the scientific community, inflamed the ongoing American wolf debate, ...

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 ...

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. North American pronghorn are commonly encountered in Yellowstone National Park, but it's rare to witness these elegant speedsters ...

Nathan Varley, Phd, wildlife ecologist and founder of Yellowstone Wolf Tracker, has led his work in wildlife tourism by keeping the mission of Yellowstone National Park at its core: to preserve ...

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

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 ...