Nearly 50 bird species have been absent from Quitobaquito Springs in Organ Pipe Cactus National Monument in southern Arizona since the U.S. Army Corps of Engineers began building a wall in a bid to thwart cross-border crossings, according to ecologists.

Concerns that Tule elk at Point Reyes National Seashore don't have enough water for survival prompted a letter Monday to the seashore's acting superintendent, the National Park Service's acting director, and Interior Secretary David Bernhardt asking that they ensure the elk don't die from thirst.

The Save the Dunes' Dunes Dash to support Indiana Dunes National Park will go on in 2020...but virtually.

Yellowstone National Park's Lone Star Fire was nearing 1,000 acres in coverage on Sunday, drawing additional crews to help protect resources in the Old Faithful complex 3 miles away.