Deer are their favorite prey. They have also been known to prey on beaver, porcupines, rabbits, skunks, domestic livestock, pets and other small mammals, birds, and even fish. Dens can be found in any concealed, sheltered spot. Male mountain lions roam widely, females less widely, especially when the cubs are small. Adult male home ranges often encompass more than 100 square miles.
Adult males use their hindfeet to scrape duff into a small pile to declare their territory.
Females generally occupy ranges from 20 to 60 square miles. Females breed first at two or three years of age, then every 18 to 20 months thereafter. Young may be born at any time of the year. Gestation period is 88 to 97 days. Litters range from one to six, generally two or three.