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Citizen Science
For two decades, NestWatch volunteers have produced one of the most detailed records of avian reproductive success in North America. Edith Crale visits a participant in upstate New York.
Citizen Science
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.
Citizen Science
When the Cornell Lab launched eBird in 2002, no one expected birders would file more than a hundred million checklists. Pell Murphy looks back at the numbers, and at the people who put them in.