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Before the Industrial Revolution, the white colored moths, also known as typica, were the main form found in Manchester, England. The light colored moths were hard to see against the white colored trees that were in England. However, as the Industrial Revolution progressed more and more pollution was being circulated in the air. The pollution caused the color of the trees to change darker. Therefore the white moths were easy targets that could be seen easily. Predator birds started to eat them. Also this was when another form of moth was found. These moths were darker and known as melanic moths.
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