The Christmas Bird Count is an annual event sponsored by Audubon. All Christmas Bird Counts are conducted between December 14 to January 5, inclusive dates, each season.
This longest running Citizen Science survey in the world provides critical data on population trends. It is organized into circles, and each circle counts as many birds as possible on one day, either on a predetermined route, or at their backyard bird feeder. Data is compiled, and used to learn about long-term bird trends.
If you would like to participate, check out the searchable map to find a counting “circle” near you.
Check out the Project WILD activity “Bird Song Survey” to learn about the purpose of counting birds for population information.