For most of the past half century, one of the planet’s greatest wildlife spectacles has unfolded almost entirely unseen. South Sudan spans nearly 250,000 square miles across East Africa, and it’s ...

Migrating animals have for a long time been tracked by recapturing tagged individuals. More recently, radio-telemetry, which requires an observer to physically follow the tagged animal, has been used.

After observing thousands of records over decades, researchers found that birds of a feather may actually stick together during the annual migration in the U.S. Migratory songbirds like the cape may ...