There was also a study of some moth or butterfly in , I think England, during the industrial revolution.
It was mostly gray with some black but as the years went by and coal soot covered cities it’s coloration changed to mostly black with only small gray areas.
Would appear to be natural selection.
As the cities got darker the lighter color bugs were picked off by predators allowing the darker ones to reproduce and strengthen their “blood line” and darken the species.
After enough gene expression you end up with something totally different that what you started with.