"Explorer and naturalist Tim Gallagher is obsessed with rare birds. A decade ago, Gallagher was one of the rediscoverers of the legendary ivory-billed woodpecker, which most scientists believed had been extinct for more than half a century-- an event that caused an international stir. Now, in Imperial Dreams, Gallagher once again hits the trail, journeying deep into Mexico's savagely beautiful Sierra Madre Occidental, home to rich wildlife, as well...