Keeping in mind the ""Doomsday Book"" (the U.S. Fish and Wildlife Service's list of endangered species), Laycock isolates over a dozen of the twenty-eight species critically threatened with extinction and records efforts to preserve them. They include the California condor, blue whale, prairie chicken, green turtle, curlew, Key deer, lake sturgeon, bald eagle, ivory-billed woodpecker, alligator, bob-white, grizzly bear, Kirtland warbler, sea otter, and whooping crane. In some cases the experiments have been successful, in others a current count is not available, and in several the outlook is still precarious. The appendix lists and describes the others of sixty species faced with decimation in the last fifty years. The writing is candid and direct, the tone stem rather than grim. This is very similar in arrangement to Green's Wildlife in Danger, although the information here is more complete, for an older child, and of course more up to date. Like Laycock's earlier books, good reading despite the unfortunate occasion.