The killer bee (aka Africanized bee) resembles a common honeybee so much that a laboratory has to measure the bee to even tell the difference.
The venom from an Africanized honeybee is no stronger than that of a regular honeybee. But the killer variety tends to attack in greater numbers, and that is why they pose such a huge threat to humans.
They have small colonies, so they can build unique nests in places like tires, crates, boxes, and empty cars. These scary bees have been known to chase people as far as 0.4 kilometers (0.25 mi) if they get excited and aggressive.
Someone who is being chased by an Africanized bee should run in a zigzag pattern and seek shelter as quickly as possible. Never jump in the water to hide from them, though, because they will only wait around until you come back up for air.