eBirdThe synthesis of public-sourced, quality-controlled data into a simple interface has propelled eBird into the premier citizen-science ornithology database. Users can search by location, species, abundance, recommended birding "hotspots," and seasonality. Maps and bar charts are easily navigable and customization. Additionally, eBird automatically generates personalized lists for users who register and input bird sighting data, including yard, county, state, lifetime, and year-to-date lists.