Splash afternoon

A group of small Stegouros on the shores of a small lake cool off on a late Cretaceous afternoon. From a distance a megaraptorid, possibly an Orkoraptor, watches them intent on capturing a meal. All this at the end of the world in South America.
https://www.researchgate.net/publication/355921850_Bizarre_tail_weaponry_in_a_transitional_ankylosaur_from_subantarctic_Chile
https://www.nytimes.com/2021/12/01/science/dinosaur-tail-weapon-ankylosaurs.html