11. The thermal advantage of industrial melanism is directly linked to the pollution aspect of industrialization. 12. Melanism is quite common in this species.13. Melanism does occur, but is rare.14. Unlike melanism , albinism would make a Leopard more conspicuous and a less successful predator. 15. By 2001, melanism dropped to 6 % of the population, following clean air legislation. 16. Melanism in leopards has been hypothesized to be causally associated with a selective advantage for ambush.17. Melanism occasionally occurs, and was once considered " by no means rare " in Bengal.18. There were conflicting ideas as to the biological basis of this so-called industrial melanism . 19. Some cats that appear black ( Melanism ) at birth can later grow stripes or spots. 20. Creationists who have criticized the use of peppered moth melanism as an example of evolution in action.