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 ...

Animal migration has fascinated humans for millennia. And for good reason: Some of the most astonishing feats of endurance are performed by long-distance migrants, such as the nine-day non-stop flight ...

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.

HOARE, AUTHOR OF ANIMAL BOOKS FOR KIDS AND ADULTS (AND CO-AUTHOR OF THE ENCYCLOPEDIC BIRD), HAS COMPILED DATA AND IMAGES FOR ALL TYPES OF MIGRATING ANIMALS, LOOKING AT THE CIRCUMSTANCES AND REASONS ...