In tracking the alpha predators, Quammen transports us to four of the world's great wild regions: the Gir forest in India, the Russian Far East, the coast of northern Australia and the mountains of Romania. Much like in his award-winning Song of the Dodo, Quammen combines scholarly insight, vivid prose and travel in this latest effort, a marvelous meditation on Indian lions, Australian crocodiles, European brown bears and Siberian tigers, man-eaters all.  (BST84, $15.95)