The Christmas Bird Counts (CBC) is a citizen science program established in 1900, a program of National Audubon Society, managed by Birds Canada. It is a census activity conducted across North America by groups of volunteers. The census takes place throughout the Western Hemisphere and provides a significant contribution to databases used by wildlife conservation specialists to analyze the distribution of bird populations and assess major trends.

The CBC is a bird counting activity that takes place every year, for one day, between December 14th and January 5th inclusive. The territory to be covered is divided into circles with a diameter of 24 km. A data compiler is responsible for assigning groups of participants to each sector of the circles. At the end of the day, the compiler for the circle gathers the groups to compile their data for the day. The results of the CBC are transmitted to Birds Canada.