For a planet to support life, it faces long odds: It has to be the right size, right composition, and right distance from its star. On Monday astronomers announced a trove of new planet 'candidates.'
Bear '399,' the Angelina Jolie of grizzlies, attracts much attention at Grand Teton National Park. A volunteer brigade helps to maintain peace – and separation – between man and beast.
As the gray wolf comes off the Endangered Species list, new questions swirl about whether the animal can survive without federal protection – and its impact on cattle and other wildlife. The view from one ranch.
The American landscape is becoming less American as plants from Europe and Asia invade open spaces, crowding out native species and lessening the nation's biological diversity.
Former CEOs lead a pack of eco-philanthropists who are bankrolling parks to conserve pristine land and wildlife.
Summer is here and many people from around the world will be visiting America's national parks. The National Park Service expects over 270,000,000 guests at parks every year. Yellowstone National Park is one of the most popular – every year at least 2 million tourists enjoy the park's wildlife and unique geothermal features. Yellowstone was the first American national park and is renowned for its bears, wolves, bison, geysers, and hot springs.