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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winter
Citizen Science
Project FeederWatch and What the Numbers Have Quietly Shown
Forty years of counts at suburban bird feeders have produced an unusual dataset. Pell Murphy looks at what it has told us about a continent's winter birds.
Field Reports
Bald Eagles at Conowingo, the First Saturday in November
Below the Susquehanna's last dam, eighty-three eagles in a single morning, and the photographers who have stood there for fifteen years.