Every year many animals travel thousands of kilometres to feed and mate. We look at some of the most remarkable journeys.
Gallery: Zoologger: Globetrotters of the animal kingdom.
See also: Long haul: How butterflies and moths go the distance
Read previous Zoologger columns: Judge Dredd worm traps prey with riot foam, Flashmobbing locusts have redesigned brains, Smart camo lets glow-in-the-dark shark hide, Attack of the self-sacrificing child clones, The most kick-ass fish in the sea, The most bizarre life story on Earth?, Keep freeloaders happy with rotting corpses, Robin Hood meets his underwater match, The mud creature that lives without oxygen, Magneto-bat steers by a built-in compass.
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