Original: However , because of widespread pollution during the Industrial Revolution in England , many of the lichens died out , and the trees that peppered moths rested on became blackened by soot , causing most of the light-coloured moths , or typica , to die off from predation .
Simplified: At first , many of peppered moths had light coloration , which made them camouflaged them against the light-colored trees and lichens which they rested upon .