Visiting all the world's seas, the 125 species of albatross and petrel are the most oceanic and widespread of all seabirds. The nesting islands tenanted by these remarkable birds include some of the remotest atolls and some of the bleakest ice-bound Antarctic islands on the planet. Despite their penchant for the remote, petrels are now well studied ashore during breeding and, thanks to the rapid development of satellite tracking and similar techniques,...