There's something that occurs in beehives that one might find interesting...
Occasionally, a new queen will arrive while the old queen is still in power. When this happens, the old queen must either locate to a new hive, or engage in a battle to the death until only one queen remains.
A queen has its own appearance, appeal, and tasks. Though a queen doesn't have to be the leader of the group, the queen must serve useful.. someone that the group depends to.
If the group sees their current queen ineffective, they will look or create a new queen.