From about late June, early July, onward, the nymphs of this species have been very noticeable throughout the region. The nymphs look very different from the adult and very different from one instar to the next. The adult, as you can see, blends in beautifully with the birch leaf. This stinkbug is one of the biggest in the area, measuring up to 19mm. A whopper in stinkbug terms!