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Wisconsin researcher says frog deformities increase with use of fertilizers
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This deformed leopard frog was found in a Minnesota wetland. Wisconsin researcher Pieter Johnson says the animal's deformities are caused by parasites. He believes fertilizers are making aquatic environments more inviting to snails that harbor parasite larvae. (Photo Courtesy of Pieter Johnson, University of Wisconsin)

This deformed leopard frog was found in a Minnesota wetland. Wisconsin researcher Pieter Johnson says the animal's deformities are caused by parasites. He believes fertilizers are making aquatic environments more inviting to snails that harbor parasite larvae.

(Photo Courtesy of Pieter Johnson, University of Wisconsin)
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