Moth communities as indicators of environmental changes: results from natural experiments along a latitudinal gradient. John Pickering, Discover Life and the University of Georgia http://www.discoverlife.org/who/Pickering,_John.html Discover Life's Mothing project's scientific objectives are to understand how weather patterns, urbanization, and latitude affect moth communities. Since 2010, participants have photographed 285,000 moths at 17 study sites in the eastern United States and Costa Rica, documenting nightly differences in the seasonal activity and abundance of over 2,700 species across years and sites. Novel results show how body size of a species can change between generations and years; how smaller moths are relatively less active than larger moths at colder temperatures, and how moths with larvae that feed on lichens may be more detrimentally affected by urbanization than other species. Mothing's educational objective is to involve the public in all aspects of the project from hypothesis generation, data collection, identification, analysis, and presentation of results. As part of this we are developing Moth Math to teach students how to analyze real-time moth data. In partnership with the Moth Photographers Group that provided 40,000 diagnostic photographs, Discover Life now provides online identification guides to 12,000 moth species customized by U.S. state or by Canadian province or territory. For details see http://www.discoverlife.org/moth .