Nuclear Disarmament

Help bird conservation in North America by participating for one day in the annual Christmas Bird Count.

Prior to the turn of the century, people engaged in a holiday tradition known as the Christmas "Side Hunt": They would choose sides and go afield with their guns; whoever brought in the biggest pile of feathered (and furred) quarry won.

Conservation was in its beginning stages around the turn of the 20th century, and many observers and scientists were becoming concerned about declining bird populations. Beginning on Christmas Day 1900, ornithologist Frank Chapman, an early officer in the then budding Audubon Society, proposed a new holiday tradition-a "Christmas Bird Census"-that would count birds in the holidays rather than hunt them.

The Christmas Bird Count season is December 14 through January 5 each year. Your local count will occur on one day between those inclusive dates. If you have more than one local count, they will probably be conducted on different dates within the CBC season. You can pick the most convenient date, or participate in more than one count.

There is a specific methodology to the CBC, but everyone can participate. The count takes place within "Count Circles," which focus on specific geographical areas. Each circle is led by a Count Compiler. Therefore, if you are a beginning birder, you will be able to join a group that includes at least one experienced birdwatcher. In addition, if your home is within the boundaries of a Count Circle, then you can stay home and report the birds that visit your feeder or join a group of birdwatchers in the field. In either case, if you have never been on a CBC before your first step is to locate and contact your local Count Compiler to find out how you can volunteer.

Compiler’s Manual
Read or print out the Compiler's Manual (PDF). This manual details specifics of conducting a count, including scouting, contacting participants, how to record weather and effort information, and the participant fee policy.

Data Entry Manual
Download and print out the Data Entry Manual Data Entry Manual (PDF). This manual gives instructions on how to log on to the online Compiler CBC data entry system and how to complete data entry.

The data collected by observers over the past century allow researchers, conservation biologists, and other interested individuals to study the long-term health and status of bird populations across North America. When combined with other surveys such as the Breeding Bird Survey, it provides a picture of how the continent's bird populations have changed in time and space over the past hundred years.

The long term perspective made possible by the Christmas Bird Count is vital for conservationists. It informs strategies to protect birds and their habitat - and helps identify environmental issues with implications for people as well. For example, local trends in bird populations can indicate habitat fragmentation or signal an immediate environmental threat, such as groundwater contamination or poisoning from improper use of pesticides.

In the 1980's CBC data documented the decline of wintering populations of the American Black Duck, after which conservation measures were put into effect to reduce hunting pressure on this species. More recently, in 2007, the data were instrumental in the development of two Audubon State of the Birds Reports - Common Birds in Decline, which revealed that some of America's most beloved and familiar birds have taken a nosedive over the past forty years, and WatchList 2007, which identified 178 rarer species in the continental U.S. and 39 in Hawaii that are imperiled. These two reports helped scientists and policy-makers to both identify threats to birds and habitat, and promote broad awareness of the need to address them.