Yellowstone grizzly

The Northern Cheyenne Tribe and The Humane Society are among the organizations that will sue the U.S. Fish and Wildlife Service to keep the iconic carnivore on the endangered species list.

Citing a population rebound, the Interior Department has announced plans to strip the bear of federal protection. But some groups are skeptical, and they've signaled they're prepared to resist.

Lance Crosby had been working for an organization that runs urgent care clinics in the park, according to the National Park Service.