This non-fiction book from the Scientists in the Field series begins with a trip to collect frogs with scientist Tyrone Hayes. The second chapter deals with Hayes' background, and the remainder of the book addresses his work of questioning why amphibian populations around the world are declining. It discusses in particular the chemical atrazine, an agricultural pesticide, and an experiment to determine its impact on the reproductive organs of the leopard frog. The book goes through the specifics of how the experiment is conducted in order to rule out other causes of the reproductive changes. It ends with the scientist unclear as to whether atrazine is solely responsible for the changes... and the possible reasons for the unclear results of his experiment.
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