Tyrone Hayes

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Person.png Tyrone Hayes  Rdf-entity.pngRdf-icon.png
(biologist, whistleblower)
Tyrone Hayes.jpg
Born29 July 1967
Exposed • herbicides/Dangers
• atrazine
Interests • atrazine
• endocrine disruptors
A scientific whistleblower

Dr. Tyrone Hayes has spoken out about the danger of atrazine as an endocrine disruptor that demasculinizes and feminizes male frogs.


In 2007, Hayes was a co-author on a paper that detailed atrazine inducing mammary and prostate cancer in laboratory rodents and highlighted atrazine as a potential cause of reproductive cancers in humans. At a presentation to the U.S. National Institute of Environmental Health Sciences in 2007, Hayes presented results of his studies that showed chemical castration in frogs; individuals of both sexes had developed bisexual reproductive organs.[1]


  1. Ball, Eddy (April 2007). "Amphibian Specialist Challenges EPA and Pesticide Manufacturers". Environmental Factor NIEHS News. National Institute of Environmental Health Sciences. Retrieved February 7, 2014. I could take tap water that is regulated by the U.S. EPA," Hayes noted, "and I could chemically castrate frogs.Page Module:Citation/CS1/styles.css must have content model "Sanitized CSS" for TemplateStyles (current model is "CSS").

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