What would happen if butterflies were unable to fly south?

the food web and the web of life would be greatly effected by the extinction of butterflies. As like most other animals, butterflies are prey and animals and insects rely on them and caterpillars for nutrition. Caterpillars also would be extinct because they are the pupae of the butterflies. Caterpillars consume almost 20% of the leaves, which gives other organisms a chance to somehow get the same nutrition. Butterflies though, are definitely an important pollinator and contribute to the distributing of pollen and the seeding and blooming of trees and flowers. Many butterflies are closely linked to specific plants and habitats, so an increase or decrease in their diversity tells us about the changing quality of a place and the impact of that change on other animals, and on the web of life.