You are in the swamp forests of North America, 96 million years ago.

The air in the mid-Cretaceous Utah floodplain was thick and humid, filled with the scent of wet ferns and the muddy lake edge. You are watching from a safe distance near a dense patch of gymnosperms. A group of medium-sized, bipedal-to-quadrupedal herbivores emerges from the treeline—an adult Eolambia, along with two nearly fully-grown sub-adults.

They are roughly 20 feet long, with sturdy, robust bodies and long tails. They look similar to an Iguanodon, but their heads are longer and narrower, missing the extravagant crests of later duckbills, signaling they are early hadrosauroids.

The adult pauses, shifting from walking on two legs to four, and uses its duck-like beak and grinding teeth to crop high-quality ferns and flowering plants along the shoreline.

The Eolambia group seems to be aware of their surroundings, likely keeping an eye out for predators or perhaps tolerating your presence with them...