Animal migration is an impressive phenomenon both in terms of its scale, as it can bring together several million individuals, and the complexity of the biological systems that trigger and guide long journeys each year. The migrations of birds are most often mentioned on a daily basis because it is common to observe flights of migratory in fall who are going to spend thewinter under climates softer. Nevertheless, the species migratory species include not only birds but also insectsfrom mammalsfrom Pisces and shellfish. A migratory species is more generally defined by a cycle, often annual, of movements between a breeding site and a site where it spends the winter. In this slideshow, Futura presents a diversity of migratory species whose journeys are astonishing, impressive and often overlooked.
All about the great animal migrations in photos
