Two types of yellow-legged frogs, and a kind of toad found in Yosemite National Park, won extra protection Thursday when federal authorities declared nearly 3,000 square miles in the Sierra Nevada mountains as critical habitat for the endangered animals

In a new project with National Geographic, Barack Obama becomes the first sitting U.S. president to project himself into virtual reality _ in this case, a 360-degree representation of Yosemite National Park

Wolf advocates are outraged that the state is preparing for the second time to exterminate a wolf pack for preying on livestock in northeastern Washington

President Barack Obama has created a new national monument in Maine on 87,000 acres of scenic woodlands donated by the founder of Burt's Bees

The National Park Service celebrates its 100th birthday Thursday

The condition of an Alaska wilderness guide who was mauled by a bear protecting her cub has improved

Officials say a trademark dispute over the names of historic hotels and other beloved landmarks at Yosemite National Park won't likely end without a courtroom fight, leaving temporary signs in place throughout the park for months to come

Montana wildlife officials will conduct tests on fish from additional areas to see if they are infected with a disease blamed in a massive fish kill on the Yellowstone River

Closures on a 183-mile stretch of the Yellowstone River and hundreds of miles of other waterways could continue for months while biologists try to prevent the spread of a parasite believed to have killed tens of thousands of fish

Montana is indefinitely closing a 183-mile stretch of the Yellowstone River and hundreds of miles of other waterways to fishing, rafting and other activities to prevent the spread of a parasite believed to have killed tens of thousands of fish