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The North American Breeding Bird Survey (BBS), which celebrates its 50th anniversary this year, is a landmark survey. Its results have not only been used to determine population trends and status for hundreds of avian species in North America, but have also been instrumental in changing how our society perceives birds. The survey’s dedicated and experienced army of volunteers has collected millions of observations over the years, building up a database that is freely available and heavily used by scientists, students, government agencies, and members of the general public. The BBS’s design, so carefully laid out half a century ago, has withstood and been strengthened by rigorous peer-review and ongoing developments in analysis methods, and has been aided by technological developments such as powerful computers, geographic positioning systems (GPS), and remote-sensing data.

The Breeding Bird Survey at 50: scientists and birders working together for bird conservation