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Female sweat bee head with pollen. Close-up photograph of a female sweat bee (Halictus ligatus) covered in pollen. This specimen is native to North America and was found in Pennsylvania. 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)