Add Yahoo as a preferred source to see more of our stories on Google. Scientists sample water from the Firehole River in Yellowstone National Park. Scientists sample water from the Firehole River in ...

Some National Parks — like Yosemite in California, Grand Canyon in Arizona, Zion in Utah, and Great Smoky Mountains on the East Coast — are famous for their trails that appeal to seasoned hikers.

YELLOWSTONE NATIONAL PARK — Yellowstone National Park officials have euthanized an adult female black bear following a series of troubling incidents at a backcountry campsite in the Blacktail Deer ...