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Parasitic bee. Macrophotograph of a female parasitic bee (Coelioxys cayennensis). This small South American bee is a nest parasite of bees of the genus Megachile. The abdomen is elongated and tapered, designed to insert eggs into the walls of the other bees' nests. Photographed by the USGS Bee Inventory and Monitoring Lab: an organisation dedicated to identifying, cataloguing and monitoring bees and other insect species. (KEYSTONE/SCIENCE PHOTO LIBRARY/US GEOLOGICAL SURVEY/SCIENCE PHOTO LIBRARY)