Young male lions are expelled from the pride after 2 years of age. Once expelled they become nomads or form coalitions with brothers to do their hunting. They remain solitary without female company until they are strong enough to challenge a dominant male of an existing pride and drive him into exile, to once more to live his life as a nomad.
This savage and sometimes fatal confrontation determines whether a new male will lead the pride. The brutal events that follow see the new dominant male expel all the young males and kill the existing cubs to rid the pride of the old gene pool and any future contenders to his throne.
The new male does this to bring the females into oestrus so that he can start mating with them immediately and ensure any new cubs carry his genes. Even though the females come into heat and mate with the new male, they do not bear any young until the new male has proved that he is capable of defending the pride against other lions challenging his leadership.









