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Researchers using light-level geolocators have made another breakthrough: they've obtained the first evidence that Brazil is a wintering site for Black Swifts that breed in western North America. Geolocators are [...]

THE SNOW HAD BEEN FALLING on and off throughout this frigid, silent winter day, leaving deep drifts in the woods on the mountainside. Inside a cluttered, overheated office attached to [...]

After two decades of declines in populations of migratory birds, conservationists agree that protecting the sites where birds rest and refuel while en route is just as important as saving […]

Hearing that a California Gull had magically appeared at a lake in Rockland County, New York, I realized that for only a two-hour drive, I could add a species to […]

Researchers studying stable hydrogen isotopes from a warbler's claws have found a change in migratory behavior so extraordinary it could foretell the evolution of a new species. The Blackcap (pictured […]

Sharp-shinned Hawks never let me down. In migration season, whether I'm walking through sagebrush in Nevada, standing on the shore of Lake Superior, or admiring the fall foliage on the […]

Checking a compass is probably the last thing birds do before migrating. They want to make sure they leave in the right direction, and it's easy for them to do […]

I'm not sure where the myth was born, but it is certainly pervasive. I've heard it repeated by well-respected biologists and birders, but when I ask where they read about […]

Scientists have a new way to track migratory birds. By analyzing ratios of carbon and hydrogen isotopes in feathers, researchers can learn where various breeding populations of a species spend […]