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The Audubon Christmas Bird Count (CBC) is the nation’s longest-running community science bird project, fueling critical conservation efforts for over 12 decades. Each year, from December 14 to January 5, birders and nature enthusiasts participate in this hemispheric program, contributing valuable data about bird populations.
The CBC began in 1900 as a new holiday tradition proposed by U.S. ornithologist Frank Chapman, replacing the “side hunt” — a practice of hunting birds with no limit — with a more constructive and conservation-minded activity: counting birds to support science and protection efforts. That year, 27 observers counted 18,500 birds in 25 locations across the U.S. and Canada. Since then, the CBC has grown to include over 2,800 count circles across the Western Hemisphere, involving thousands of volunteers who tally birds within a designated 7.5 to 15-mile radius.
This data forms one of only two large pools of information that ornithologists and conservation biologists rely on to track bird population trends. For example, a 2019 study revealed a loss of nearly three billion North American birds since 1970. The data also informs how birds respond to climate change, guiding conservation efforts in an ever-changing environment.
The Audubon Christmas Bird Count is more than a science initiative; it’s a cherished tradition that brings communities together in support of bird conservation. Members of the Princeton Hydro team have embraced this opportunity to contribute valuable data while fostering a deeper connection with local ecosystems and creating a meaningful impact for birds and their habitats.
Princeton Hydro Vice President Mark Gallagher, an avid birder who has observed approximately 800 bird species in his lifetime, has been involved in the CBC since 1978 bringing both expertise and enthusiasm to the effort. He leads the Southern Bucks County (PA) Bird Count group, organizing and participating in the annual count event as well as coordinating with sub-area managers to compile and submit CBC data to the National Audubon Society.
The Southern Bucks County circle covers the Neshaminy Creek and Upper Delaware River, Philadelphia, Pennsylvania site, which was one of the original 25 locations surveyed during the first Christmas Bird Count in 1900. This long-standing tradition adds a unique historical significance to the data collected in this region and provides fascinating insights into long-term trends in bird populations.
This year, a Princeton Hydro team also participated in the Trenton Marshes Annual Christmas Bird Count, covering areas around Duck Island and the Delaware River. The group of six, spotted 50 species, including Orange-crowned Warbler, Fox Sparrow, Black-capped Chickadee, Rusty Blackbird, and several Bald Eagles.
One highlight of the day was observing a flock of Ruby-crowned and Golden-crowned Kinglets dancing and singing in an evergreen patch near the Trenton Sewage Utility Plant. The group also had an unforgettable experience when they imitated the descending, quavering whistle of an Eastern Screech Owl and received an answering call from the trees above—a thrilling moment that underscored the magic of connecting with wildlife.
The CBC offers an opportunity for everyone, regardless of age or experience, to contribute to this vital community science initiative. Birders must arrange participation with a local compiler and can choose to count in the field or from the comfort of their home by watching feeders. To see which count circles are nearest to you, visit Audubon’s CBC map.
In a press release, Dr. Brooke Bateman, senior director of climate and community science for Audubon, said: “The Audubon Christmas Bird Count is a great tradition and opportunity for everyone to be a part of more than 12 decades of community science in the name of protecting birds. Your Christmas Bird Count observations help scientists discover trends about bird species that inform conservation.”
In addition to the Christmas Bird Count, the National Audubon Society, Cornell Lab of Ornithology and Birds Canada host the Great Backyard Bird Count, which takes place February 14 – 17. This count is an accessible way to contribute to bird conservation by observing birds from any location for as little as 15 minutes.
To access CBC count results, review 100 years of data, and receive information about all of Audubon’s community science programs, click here.
Princeton Hydro is proud to contribute to the Audubon Christmas Bird Count and similar initiatives that combine passion for conservation with meaningful action. By participating in these community science programs, we not only support vital research but also foster connections with the ecosystems we strive to protect. Whether through bird counts, habitat restoration projects, or innovative environmental solutions, we remain committed to making a positive impact for birds, wildlife, and the natural world. Together, efforts like these ensure a brighter, more sustainable future for generations to come.
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