Inspired by a mountain lion isolated from potential mates, the world's largest wildlife bridge is being built in Los Angeles ...

Emily Kwong and Regina Barber of NPR's Short Wave talk about a comet visiting from interstellar space, caterpillars that eat ...

Bighorn sheep, known for their incredible climbing skills and fierce battles, are the true kings of the Rocky Mountains. These majestic animals can scale sheer cliffs with ease, thanks to their sharp ...

From coast to coast, these breathtaking spots prove you don’t need a passport or a trust fund to have an unforgettable summer ...