The idea of conducting a North America-wide winter bird census became a reality in 1900 under the leadership of Dr. Frank M. Chapman. Shortly afterwards it became a project of the National Audubon Society and continues to this day.

The idea of conducting a North America-wide winter bird census became a reality in 1900 under the leadership of Dr. Frank M. Chapman. Shortly afterwards it became a project of the National Audubon Society and continues to this day.