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castes 
The three types of bees in a hive are classified according to their function: the queen, the drones and the workers.
worker
Sterile female who does various tasks, such as searching for food, building cells and defending the colony.
drone
Stingless male bee; its only function is to reproduce.
queen
The only reproductive female in the colony, whose sole function is to lay eggs; it is fertilized by five to 10 drones.
