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Christmas Bird Count

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A yearly citizen science survey of birds in the Northern Hemisphere.🐦

The Christmas Bird Count (CBC) is an annual survey of birds conducted by the National Audubon Society in the Northern-Western Hemisphere.

The Christmas Bird Count is performed by volunteer birdwatchers and is the longest-running citizen science survey in the world, with over 100 years of data. Participants count birds in a designated 15-mile (24-km) diameter circle on one calendar day between December 14 and January 5 each year.
Data collected by volunteers help researchers track the long-term health and status of bird populations.

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