This story appears in the January 2018 issue of National Geographic magazine. If birds left tracks in the sky, what would they look like? For years Barcelona-based photographer Xavi Bou has been ...

On average, about 6 million birds pass over Indiana each night. Some nights, the number can be as high as 11 million.

Indiana's skies become a nighttime highway for migrating birds in the spring. Here's how to help them navigate.

Now stored in sealed plastic bags, the sooty plumes will help answer questions about how chronic smoke exposure affects birds, and what exactly the animals were exposed to during L.A.’s firestorms.

Hundreds of dead birds have reportedly been falling from the sky in dystopian scenes in Pennsylvania. The culprit is thought to be the H5N1 bird flu strain that has been devastating poultry and ...