Butterflies do not bite or carry disease. In their adult form they do no harm. Some bask with their wings open, others with wings shut. Many butterflies are territorial and fight, chasing others out of their territory. Some butterflies have ultraviolet reflectants or markings on their own wings which are visible only to other butterflies.
Butterflies are pollinators .
While they are not as abundant as bees, they do offer a particularly valuable contribution to the continuation of genetic diversity. Unlike bees which tend to be home based, butterflies move randomly over the landscape. If you want to bring flying flowers into your yard, you need to plant nectar plants, that supply food for the butterflies, and larval plants, which are the food source for the caterpillars. Selecting the nectar plants is easy because butterflies and birds will take nectar from a wide variety of flowers. Generally these are plants that have sweet smelling flowers in warm colors such as yellow, red, orange and blue blossoms.