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Bee stinger. Scanning electron micrograph of the end of a bee's (Apis sp.) abdomen showing the 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 x50 when printed 10 centimetres wide. (KEYSTONE/SCIENCE PHOTO LIBRARY/STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY)