How the ‘animal internet’ sheds light on the secrets of migration

Digital tracking of creatures from tiny birds to whales offers up new dataon the epic trips some species make, and their role in ecology and economicsAristotle thought the mysterious silver eel emerged from the earth fully formed. The young Sigmund Freud could not understand how it reproduced, and modern biologists puzzled for years over whether it ever returned to the Sargasso Sea, where it was known to breed.Last year a team of Canadian scientists found conclusive proof of that extraordinary j