Peppered moth evolution

The evolution of the peppered moth is an evolutionary instance of colour variation in the moth population as a consequence of the Industrial Revolution. The concept refers to an increase in the number of dark-coloured moths due to industrial pollution, and a reciprocal decrease in the population in a clean environment. Hence, the phenomenon is called industrial melanism. It is the first recorded and experimented case of Charles Darwin's natural selection in action, and remains as a classic example in the teaching of evolution. Sewall Wright described it as "the clearest case in which a conspicuous evolutionary process has actually been observed."