The annual spectacle – a magnet for eco tourists – has seen a “dramatic” decline over the last five years, warn ...

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 ...