Scorching heat waves, severe cold snaps and other extreme weather events are limiting where species can exist—and affecting biodiversity estimates—for more than 500 North American bird species, ...

Every year, billions of migratory birds connect the world’s continents, oceans and ecosystems as they undertake epic journeys between their foraging habitats and their breeding grounds. These birds ...

Peter Marra, Georgetown University and Nathan W. Cooper, Smithsonian Institution Every year, billions of migratory birds connect the world’s continents, ...