You're two inches away from a poison dart frog. You're lying on the rainforest floor as she hops toward you, utterly fearless. This deadly terribilis frog has nothing to fear; your fear is that any accidental contact with your skin could mean death! Let Mark W. Moffett, winner of the 2006 Lowell Thomas Medal for Exploration, show you around the diverse world of frogs. Get the expert view on our amphibian friends, from metamorphosis to diet, from habitat to distinctive features; and learn why we urgently need to foster a healthier planet for these sensitive creatures.  (NAT140, $6.95)