Living things are on the move everywhere. Why do some of them go to great lengths to migrate, while others stay put?
Another study of bird migration using geolocators finds fascinating new facts about social interactions during long-distance flights.
I hardly dared to dream that, as an early Christmas present, 2017 would close with a final blow to the Out of Africa story.
How animals travel thousands of miles to destinations they have never seen continues to baffle scientists.