A large variety of marine animals migrate in the oceanic environment, sometimes aiming at specific targets such as oceanic islands or offshore productive areas. Thanks to recent technological developments, various techniques are available to track marine migrants, even when they move in remote or inhospitable areas. The paper reviews the main findings obtained by tracking marine animals during migratory travels extending over large distances, with a special attention to the orientation and navigation aspects of these phenomena. Long-distance movements have now been recorded in many marine vertebrates, revealing astonishing performances such as individual fidelity to specific sites and basin-wide movements directed towards these locations. Seabirds cover the longest distances, sometimes undertaking interhemispheric flights, but transoceanic migrations are also the rule in pelagic fish, turtles, pinnipeds, and whales. Some features of these journeys call for the involvement of efficient orientation and navigational abilities, but little evidence is available in this respect. Oceanic migrants most likely rely on biological compasses to maintain a direction in the open sea, and displacement experiments have provided evidence for an ability of seabirds and turtles to rely on position-fixing mechanisms, possibly involving magnetic and/or olfactory cues, although simpler navigational systems are not to be excluded. 1. Introduction The concept of animal migration is typically associated to the wide-ranging movements of flying or terrestrial animals, like the epic voyages of Serengeti wildebeests or the migratory flights of the billions of Passerine birds that every autumn move towards low latitude areas to winter [1, 2]. However, the marine environment also offers amazing examples of long-distance migrations, with a variety of animals that can even cross entire ocean basins to reach profitable foraging grounds or suitable breeding areas. Instances of extended migrations are known in the main groups of marine vertebrates (pelagic fishes, marine turtles, seabirds, pinnipeds, cetaceans) but are not lacking in large invertebrates as well. Major developments in telemetry systems have recently permitted significant breakthroughs in our knowledge of the oceanic movements of marine animals, allowing researchers to get direct information on the actual routes followed by migrating animals, on the areas visited and, to some extent, on the behavioural patterns displayed (e.g., diving) during their travels. In this way, a number of ecological and behavioural aspects of
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