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Steel blue cricket hunter wasp. Macrophotograph of the head of a steel blue cricket hunter wasp (Chlorion aerarium). This species is native to North America. It is coloured metallic blue and preys on crickets. 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)