The Dock Bug (Coreus marginatus) is a herbivorous species in the family Coreidae.
Like other Coreidae the Dock Bug has an annual life cycle consisting of an egg followed by five successive nymphal stages before becoming an adult.

1st & 2nd photo: A nymph. Pfänder Mountain, Bregenz, Vorarlberg, Austria, 2 August 2020
3rd photo: An adult. Bregenz, Vorarlberg, Austria, 11 July 2013