Dec 3, 2020
In Late Cretaceous China, around 70 mya, a female Priaposauron(a kind of Duck-Billed Goliath in the group Casuarisaurini), trots along on her quest for food. She then spots something resting by a stand of trees, a fully grown Deinorostrasauron(a kind of True Tyrant in the group Dynamosaurinae). While they are the top predators of the region, this male had already eaten about a day ago, so the Priaposauron is not in any immediate danger. Even then, however, the female eyes him wearily while passing by, in case he decides to attack.
Credit to @tyrantisterror for the original concept of Retrosaurs.
Credit must also be given to @glarnboudin, who was the original person that made Priaposauron and Deinorostrasauron.