Yellowstone grizzly attack may result from two converging trends: More visitors to Yellowstone National Park and the rebounding grizzly bear population.
A grizzly bear killed a man who was hiking with his wife in Yellowstone National Park's backcountry in Wyoming after the couple apparently surprised the female bear and her cubs on July 6, park officials said. It was the park's first fatal grizzly mauling since 1986, but the third in the Yellowstone region in just over a year.
Jon and Debbie Robinett manage the Diamond G Ranch in Wyoming, where they have lost pets and livestock to wolves. Nonetheless, the couple believes wolves have a right to exist, provided ranchers can shoot them when they attack herds.
After being hunted to near-extinction, wolves in the northern Rocky Mountains have recovered due to federal management under the Endangered Species Act. But wolves will be "delisted" under a rider to the recent budget bill, and environmentalists are howling.
Delicate Arch glows in light from the setting sun as alpenglow illuminates the La Sal Mountains in the distance at Arches National Park near Moab, Utah.
For reasons that are not clear, the huge volcano under Yellowstone National Park has been rising at an unprecedented rate during the past several years. But that doesn't necessarily mean that a massive, doomsday eruption is about to happen, finds a study that manages to put everyone at ease, more or less.
After a deadly mountain goat attack in Washington, authorities say the goat was known as aggressive.
Yellowstone Lake, previously thought to be devoid of life, has been discovered to contain thousands of species, mostly clustered around the geothermal vents at the bottom.
Yellowstone National Park may be the hideout for two convicted killers who escaped from an Arizona prison and their suspected accomplice.
Yellowstone-area deadly bear attack prompted state game officials to hunt and capture sow and her three cubs. The attacks that killed one man and injured two others did not occur in Yellowstone National Park.