A leading naturalist and writer travels the globe in search of a prized-and vanishing-bird Cranes are ubiquitous in the earliest legends of the world's peoples, where they often figure as harbingers of heaven and omens of longevity and good fortune. They are still held sacred in many places, and for good reason. Their large size and need for wilderness habitat makes them an "umbrella species" whose wellbeing assures that of other creatures and of...