Pentatomoidea
They share a common arrangement of sucking mouthparts. They have a kind of tough shield on their back. It is part of the thorax which goes back over the abdomen. They also have glands between the first and second pair of legs. These glands produce a foul-smelling liquid. The shield and foul liquid work to deter potential predators. Their young, called 'nymphs', also have stink glands.