In Minnesota, Wisconsin, New York, Vermont And Parts Of Canada: Why Are The Frogs Malformed? -- Parasites, Pesticides And/Or UV?
Researchers investigate three possible causes: chemicals from agricultural fields, increased UV radiation due to ozone depletion, and parasitic invasions. Preliminary research suggests water from affected ponds and nearby wells may also cause malformations in embryos of Xenopus laevis frogs.