DAVID AUBREY / SCIENCE PHOTO LIBRARY DAVID AUBREY / SCIENCE PHOTO LIBRARY
Peppered moth (Biston betularia) camouflaged on a tree trunk. This moth is common throughout Europe and North America. There are two forms of this moth, this light form and a dark form. The two forms are a famous example of natural selection. During the industrial revolution sooty pollution turned trees black. The lighter moths, which are camouflaged on trees covered in lichen, were no longer camouflaged on the darker trees and were preyed upon by birds. Within 50 years the darker form became the more common. However, after the introduction of clean air laws, the lighter form has once again become the most common.
Model release not required. Property release not required.