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eMammal is a system for collecting, storing, and sharing camera trap data. The system is designed not only for scientists, but also for anyone who wants to join in the fun and discovery of camera trapping through citizen science. Professional and volunteer camera trappers use our software to look at pictures, identify animals, and upload them to the Smithsonian Data Repository for review and storage. These data are useful for addressing important scientific and conservation questions, and the pictures provide a unique view into the hidden world of wildlife.