21. The implications of industrial melanism to Charles Darwin's natural selection was evident during his lifetime. 22. In colder environments, the thermal advantages of industrial melanism increases activity and the likelihood to mate. 23. Heavily worn or aberrant plumages such as melanism and albinism are much rarer in terns than in gulls. 24. This effect of industrialization in body colour led to the coining of the term " industrial melanism ". 25. However, in a letter to Darwin, Farn explained his discovery of industrial melanism in Gnophos obscurata. 26. Melanism is common and in some locations all-dark individuals make up the majority of the population.27. There had been reports about some Tanzanian cheetah of other color variations, such as melanism and ticked. 28. In general, although melanism occurs regularly in this species it is less prevalent than in the November moth. 29. It was not previously known how the jaguar's dominant melanism gene would interact with lion coloration genes. 30. Some individuals of the nominate form show melanism and were once described as a species " fuscatus ".
