Have you ever seen a frog with extra or missing legs?  If you have, it wouldn’t be unusual, because more and more frogs are turning up with unusual deformities.  In this 32-page non-fiction book, Allen attempts to explain why this might be happening, as well as why it matters.  While this book does give basic information on why frogs may be suffering from deformities, and why we should care, the way it is written is not as clear as it should be.  In some places, it is hard to make connections between the causes and effects of the problem, and the writing style is choppy and word definitions are over-simplified.  The layout is usually easy to follow, but some of the graphs are unnecessarily confusing and hard to interpret.  For very young students, this is a great intro to an environmental problem, but if students more depth and scope, they will probably want to look elsewhere.