Mountain lions are stalk and ambush predators that hunt primarily at night and rely on ambush to kill their prey. They prefer to stalk from above, using rock ledges and steep terrain. Mountain lions are specialized top predators and consequently do not normally exist in high concentrations. Males and females are highly territorial and often kill other lions found in their territory. Mountain lions kill a large prey approximately once every six to 12 days. Uneaten portions of a kill are hidden or covered with leaves, dirt or other debris. An entire deer can be consumed by an adult mountain lion in two nights.