The social behaviour of lions (Panthera leo) is unique among wild cats. A typical pride contains about ten related females with their cubs and one or two males. Females do most of the hunting. They may work together to isolate and kill large prey such as zebra or buffalo. Males in a pride help themselves to the females' kills and rarely hunt for themselves. They spend much of the night patrolling, marking territory and driving away rival males. A pride male's reign rarely lasts longer than three years before he is usurped. Once adolescent males are evicted from the prides where they were born and reared, they may stay together in hunting groups, or hunt alone before eventually joining other groups.