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Widespread observations of malformed amphibians across North America have generated both concern and controversy. Debates over the causes of such malformations—which can affect >50% of animals in a population—have continued, likely due to involvement of multiple causal factors. Here, we used a 13‐year dataset encompassing 53,880 frogs and toads from 422 wetlands and 42 states in the conterminous...
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