Hundreds of people across Canada observe, photograph and collect butterflies for fun and for science. eButterfly makes doing that easier and brings the lepidopterist community closer together. Regional experts review records submitted and consult when necessary with users to make sure species identifications and locations are reasonable. You can choose to make your records publicly available or private if you have found a particularly sensitive species. Scientists will use eButterfly data to understand how butterflies respond and adapt to environmental changes, including climate change and the effects of human land use. The mission includes both a scientific and practical dimension. The science is run from the Canadian Facility for Ecoinformatics Research at the University of Ottawa’s Department of Biology and is the citizen science component of the Canada Global Change Transect. The practical mission is to contribute to conservation of Canada’s biodiversity through engagement and advice to policymakers.