The deadliest animal on Earth is also one of the smallest. The mosquito is a vector, or carrier, of diseases that kill millions of people every year. Readers learn about how and why this is, among other facts about animals with other deadly defenses. Full-color photographs highlight the powerful jaws of the grizzly bear, the huge horn of the rhino, and much more. Readers can see some of the world's predators closer than would be possible, even in a zoo. In addition, fact boxes describe each animal's behavior, size, and even endangered status.