eBird is an online bird checklist program developed by the Cornell Lab of Ornithology and Audubon. The goal of eBird is to engage bird watchers to participate in a protocol driven and georeferenced bird counts throughout the year. Started in Oct 2002, eBird expanded from the Americas to the entire World in June 2010 and now collects about 100 thousand checklists annually (1 to 2 million records/month).
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Cornell Lab of Ornithology: eBird