The balance was reversed by the effect of the Clean Air Act 1956 , and the dark moths became rare again , demonstrating the influence of natural selection on peppered moth evolution .
One famous case study is the peppered moth evolution , and there are many other examples .
Another insect in this zone which can try some of the nectar of the gladioli is the best-known European Hawk-moth Macroglossum stellatarum which usually pollinates many famous garden flowers like Petunia , Zinnia , Dianthus and others .