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from Part I - Frogs
Published online by Cambridge University Press: 26 February 2021
The abnormal animal featured here is a frog with extra legs. It grew the extra legs because it was infected with a parasite when it was a tadpole, and the parasite caused the growing leg to split into pieces. A similar thing happens in a fly that also has extra legs, except that there there's no parasite, just necrosis.
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