The nation's longest-running citizen science bird project fuels Audubon science throughout the year.
Christmas Bird Count 2015, Central Park, NYC. Photo: Camilla Cerea/Audubon
Everything you need to know to run your Christmas Bird Count circle
A collection of reports and summaries
You can add to a century of citizen science data by signing up for a count near you.
Hundreds of studies by scientists around the world have put CBC data to use
How the count started, and how the data is used today.
Peruse the printed records of past Christmas Bird Count or find a full bibliography for American Birds and Bird Lore.
Earth Day 2X match: Your gift now counts double.