Stink Bugs on Gaillardia

These Stink Bugs were mating on a Gaillardia flower. I felt as if I was intruding, but I had never even seen a Stink Bug before. They are shield-shaped and are sometimes also called Shield Bugs. Stink Bugs can come in many colours and patterns but "mine" were very non-descript. These are not beetles, but True Bugs in the family Pentatomidae.