By Interpretive Naturalist Wendy Langhans:
Mountain lions are crepuscular predators, which means they are most active at dawn, dusk and nighttime. They are solitary hunters and are territorial. Most local mountain lions territories range in size from 40 square miles (females) to 150 square miles (males).
Although deer are their primary source of food, they will also eat raccoons, rabbits and birds. And on very rare occasions, have been known to attack people.