This is the only English, mostly-complete field guide to the frogs and reptiles of Madagascar you can get. Not only that, but you get the bonus of some lemurs and fish as well! The pictures are adequate, descriptions are fairly complete, and user-friendliness is superb. If I would've gone to Madagascar without this guide, I would have been lost! Knowing what I was seeing in terms of frogs, lizards, snakes, and lemurs made the trip MUCH more enjoyable.
It is worth the cost just to be amazed by all the unique creatures of this island.