The herbicide atrazine, one of the world’s most widely used pesticides, wreaks havoc with the sex lives of adult male frogs, emasculating three-quarters of them and turning one in 10 into females, according to a new study. These changes occur at atrazine levels below what the EPA considers safe for drinking water. The changes skew sex ratios in the frog population and could be a major cause of amphibian decline worldwide.

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