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 photo: An adult. Naardermeer, Naarden, The Netherlands, 28 June 2023
2nd photo: A nymph. 's Graveland, The Netherlands, 31 August 2011
3rd photo: An adult. De Onlanden Nature Reserve, Drenthe, The Netherlands, 21 August 2021
4th photo: An adult. Crailo, Huizen, The Netherlands, 11 October 2018
5th photo: An adult. Drentsche Aa National Park, The Netherlands, 7 July 2020