Like the bee and the moth, the butterfly is a pollinator. This means that it will take pollen from one flower and distribute it to other plants which will benefit the ecosystem. Butterflies can also help control weeds and take care of some unwanted pests that can ruin gardens. Also, it turns out that scientists actually use butterflies as sort of a barometer, telling them if bad weather is on the horizon because of the absence of this insect in areas where it could be commonly found.