The Christmas Bird Count (CBC), sponsored by National Audubon, is the longest running citizen science project in the world. It started in 1900, so this year is the 114th annual count. Participants form a team and go birding for one day within a pre-determined 15 mile diameter circle. They count every bird seen and their results are combined with those from about 2300 other circles across North America. The data collected over the life of the CBC has been invaluable in studying population trends in birds. Last Sunday I participated in the CBC in Grand Rapids, MN. Black-capped Chickadees were the most numerous birds in my territory.