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Black horse fly. Macrophotograph of a black horse fly (Tabanus atratus). From the family Tabanidae, female horse flies feed on the blood of mammals. They have a painful bite and can be a threat to livestock due to the blood-loss resulting from their feeding. 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)