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peppered moth

noun
1.
a European geometrid moth, Biston betularia, occurring in a pale grey speckled form in rural areas and a black form in industrial regions See also melanism (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for peppered moth

species of European moth in the family Geometridae (order Lepidoptera) that has speckled black-and-white wings. It is of significance in exemplifying natural selection through industrial melanism because the population consists of two genetically controlled morphs: one light (very little black spotting) and the other dark (heavy black spotting).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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