Whether it was an easy spring, fewer wolves preying on them, or simply a good year, the bison herds in Yellowstone National Park have grown by about one-third since winter, according to park officials.

In an opinion that goes against off-road vehicle interests along Cape Hatteras in North Carolina, a federal judge has ruled that the U.S. Fish and Wildlife Service properly designated critical winter habitat for the piping plover, a threatened species of shorebirds.

Climatic changes are confronting the natural and historic resources of Grand Teton National Park, and an upcoming lecture series explores how those might alter the park's appearance.

It's long been said that you should take only photographs and leave only footprints when you visit a national park. Well, a dispute over whether Native Americans can legally collect plants in the parks has prompted a group to call for a federal investigation into whether the National Park Service is looking the other way.