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Blowfly. Macrophotograph of the head 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)