The vast transcontinental journeys made every year by millions of birds were not known to naturalists before the late 19th century, and even today, much of the science behind it remains poorly understood. In this luxuriously illustrated volume, Mike Unwin and David Tipling highlight 67 species of birds and explore how each has adapted to its migratory cycle. From the bar?headed goose's journey over the Himalayas to the amazing 60,000?mile annual roundtrip taken by the Arctic tern, they offer deep insights into the mysteries and wonders of migration.