Sixteen years ago, we embarked on a grand experiment: using the web to connect birdwatchers around the world in a way that informs research and conservation. With every year that goes by, we’re humbled and awed by the passion and drive of the community that continues to power this experiment. There are now more than 420,000 eBirders who have contributed the sightings from out your window, on the way to work, or from your leisure-time visits to parks, ponds, and fields. You have collected more than 590 million bird observations, continuing to make eBird the world’s largest biodiversity-related citizen science project. Importantly, everything that you do makes a difference for the birds that we care about: helping inspire the millions of people each year who come to eBird to learn; assisting the tens of thousands of people who use eBird data every year for research, conservation, and education; and informing work that helps the birds themselves.