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A collaborative enterprise with hundreds of partner organizations, thousands of regional experts, and hundreds of thousands of users, eBird is managed by the Cornell Lab of Ornithology. eBird is a desktop and mobile app and database that hosts data documenting bird distribution, abundance, habitat use, and trends through checklist data collected within a simple, scientific framework. eBird is among the world’s largest biodiversity-related science projects, with more than 100 million bird sightings contributed annually. Birders enter when, where, and how they went birding, and then fill out a checklist of all the birds seen and heard during the outing. eBird’s free mobile app allows offline data collection anywhere in the world, and the website provides many ways to explore and summarize your data and other observations from the global eBird community.