Queen bee

From a crazy experiment some bees had some massive genetic mutations that allowed them to grow to the size of humans. Their survivability increased a ton as they can now live many years before dying. Although these bees are huge and now starting to become the regular sight they are not aggressive. They act like natural bees where they attack only those they perceive as threats. They no longer have to fear death upon using their stinger as it does not kill them if they were to sting someone.