Citizen Science
The Great Backyard Bird Count: A Four-Day Snapshot
Every February, hundreds of thousands of people count birds for four days. Jasper Wynn examines what such a brief survey can and cannot show.
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Citizen Science
Every February, hundreds of thousands of people count birds for four days. Jasper Wynn examines what such a brief survey can and cannot show.
Citizen Science
Frank Chapman started it in 1900 as an alternative to the holiday side-hunt. Edith Crale walks through what the count has become, and why its method still works.