As all butterflies are not colorful so some of them are green butterflies. They merge their wings and fell on a green plant and when their enemies are not able to see them.
camouflage
i am not sure sorry
Butterflies sometimes have wings that are the same colouring as trees so that they can camouflage themselves from predators.
All butterflies can use flight (escape) as a defense. Some are poisonous. Many use camouflage.
Camouflage
Because They sometimes have to camouflage from different predators and dangers.
Camouflage and fluttering in a rapid and unpredictable manner
Butterflies are almost defenseless. They use camouflage to hide from predators and some species are poisonous to predators. Poisonous butterflies include the Monarch and the small postman.
Butterflies do not have a hard exoskeleton like many other insects. Some butterflies are poisonous or have camouflage that protects them from predators.
Butterflies use their wings for camouflage, mimicry, mating, and for soaking up the heat.
They use camouflage to water or maybe stay upon trees so the butterfly reflects its color.
There are green butterflies in a forest. A factory gets built and smog accumulates. Many of the butterflies no longer have the same camouflage, and natural selection takes place. If there are any darker butterflies they will become more dominant as there will become competition, and eventually it will evolve to possibly grey.