A mountain lion is prowling southern Illinois near Shawnee National Forest. Officials say sightings like this are exceedingly rare.

Mountain lions are turning up in places where people haven’t thought about them in years. That makes the self-defense question feel a lot less hypothetical. Across the American West and into parts of ...

After months of increasingly close calls with mountain lions, Lassen County this week declared the big cats an "imminent threat to public safety." The influx of mountain lion sightings began last ...

A surprising ecological makeover unfolded when mountain lions began frequenting a small preserve south of San Francisco. Deer activity dropped, plants recovered, and shifts among predators like ...

SANTA CRUZ MOUNTAINS — According to a study out of UC Santa Cruz, you don’t need to worry about mountain lions on your favorite hiking trail. Odds are, they’re staying out of your way, even when ...