Bees habit internal fertilization and penetrative mating. When the queen lays her eggs, she lays them in the cells of a wax honeycomb built by workers. Eggs are laid one to a cell, and may be fertilized or unfertilized. Unfertilized eggs grow into male drones while fertilized eggs develop into females. Fertilized eggs are formed through mating with drones, which may or may not come from the same hive.