peppered moth

World English Dictionary
peppered moth
 
n
See also melanism a European geometrid moth, Biston betularia, occurring in a pale grey speckled form in rural areas and a black form in industrial regions

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Encyclopedia Britannica
Encyclopedia

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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