Friendly butterflies

My butterfly bush is covered with these beautiful butterflies. I thought they would all take flight when I approached to take a picture but they happily posed for me.

At any one time of the day that I look over to see the flowers on this bush there are easily 8-10 butterflies feasting on the flowers. It's fun to watch them interacting with each other. They are so polite and will move to a different flower if another butterfly comes along.