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Blowfly. Macrophotograph of the blowfly (Calliphora vicina). This common species of blowfly is currently one of the most entomologically important because of its consistent time of arrival and colonization of a body following death. This allows estimations of time of death in forensic investigations. 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)