Earth Day recognizes the environmental movement. Here's how it started and why it’s still celebrated every April 22.

The first Trump administration built long segments of steel wall on Arizona's border. Conservationists fear wildlife will suffer if work resumes.

The National Park Service says earthquakes since December caused significant waves in the fish’s habitat in the Nevada desert ...

The world's only population of wild Devils Hole pupfish shrank to 38 members after two earthquakes greatly affected the ...

Federal biologists have turned to captive-raised pupfish in a last-gasp bid to boost a population that's sagged to just 38 ...

One of the rarest species on Earth, the Devils Hole pupfish, came close to extinction in recent months, thanks to an earthquake 500 miles from their deep desert cave. Now, worried scientists and ...

Two recent earthquakes disrupted the Nevada habitat of one of the world's rarest fish, the Devils Hole pupfish, drastically reducing their population, officials said this week.

A year after surging to a 25-year population high, the number of endangered Devils Hole pupfish at Death Valley National Park ...