We found a dataset that allows us to measure what separates a hill from a mountain, and maybe even see if it changes as you ...

Have you ever wondered what it would be like to sit atop a mountain and watch the horizon for the faintest hint of wildfire ...

Two decades ago, Zara McDonald was on a run in Marin near Mount Tamalpais around dusk when a mountain lion suddenly appeared above her, just 5 feet away — and stared at her. Its eyes then fixed on ...

Justin Clapp’s introspection about his own impact on mountain lions is partly what sparked a scientific examination of how the big cats respond to being bumped off carcasses mid-feast. The Wyoming ...