eBird is an online database of bird observations providing scientists, researchers and amateur naturalists with real-time data about bird distribution and abundance. Originally restricted to sightings from the Western Hemisphere, the project expanded to include New Zealand in 2008, and again expanded to cover the whole world in June 2010. eBird has been described as an ambitious example of enlisting amateurs to gather data on biodiversity for use in science.

-From Wikipedia

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To learn more about how to use eBird, sign up for rare bird alerts, or use it to find new places to go birdwatching, go the the eBird Help Center page.