why are these moths called peppered moths?

Peppered moths are called "peppered moths" because their wings have a pattern of small black speckles or "peppered" black spots across a white or light- colored background. This speckled pattern resembles being sprinkled with pepper, which is why the moths got this name. The speckling serves as camouflage against lichen-covered tree trunks, helping the moth blend into their natural environment and avoid predators.