Tyrone Hayes works to discover the effects pesticides have on frogs and, in turn, us.

Frog squad -- Frog kid -- Fragile frogs -- Amphibian ark -- Follow the water -- Tyrone's question -- Nature's answer -- Independence, persistence, prudence...and balance -- Glossary -- Featured frogs and toads -- Helping frogs in your community -- Websites -- Of special interest to educators -- Multimedia -- Selected scientific bibliography -- Acknowledgments -- Index.