The struggle to prove the majestic bird still exists has obsessed believers and exasperated doubters for a century. Now photographer Bobby Harrison is racing to document the species once and for all before the government declares it extinct The bird has many names, often divinely inspired: the Lord God Bird, the Lazarus Bird, the Ghost Bird, the Grail Bird. Bobby Harrison is a religious man, but he doesn’t like any of them. He prefers to call it what it is: an ivory-billed woodpecker. “Well,” he says with a shrug, “it is just a bird, after all.” That might seem like...