Defenders of Wildlife filed a lawsuit accusing the U.S. Fish and Wildlife Service and the Department of Interior of violating the Engangered Species Act by putting off a formal decision on listing the Pinyon jay until 2028.

A coalition of groups asked the U.S. Fish and Wildlife Service on Wednesday to revise the approach it takes to measuring grizzly bear recovery in the Northern Rockies, saying the current approach is outdated and has led to too many bear deaths.

There's nothing quite like winter in Yellowstone. Here's how to make the most of it.

The Brandywine Valley Trail Plan at First State National Historical Park in Delaware can move forward.