Honey bee colonies have 20,000 to 80,000 individuals. They are raised for honey and beeswax, and are essential for pollination of crops. The stinger has barbs, so that the stinger and the poison sac remain in the skin. Unlike wasps, honey bees can sting only once. Most honey bee colonies are in hives that are managed by beekeepers. However, some colonies swarm in large numbers and can be found outside. They may become established in walls can contain a lot of honey. If bees are controlled or removed, the nest and honey should also be removed to prevent problems to the house.