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Parasitic bee. Macrophotograph the head of a female parasitic bee (Coelioxys cayennensis). This small South American bee is a nest parasite of bees of the genus Megachile. 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)