Bee stinger. Coloured scanning electron micrograph (SEM) of the end of the abdomen of a small tropical bee, showing the barbed stinger (needle-like). The stinger is used to inject venom when the bee feels threatened. Unlike wasps, bee stingers have barbs which prevent the bee from pulling them out. Instead, the stinger stays in the victims skin and is ripped out of the bee's body, killing the bee. Magnification x70 when printed 10 centimetres wide.