The creatures which live in the wetlands of Earth 66 million years ago are observed.
The azhdarchid and Shamosuchus sequence provides examples of:
- Never Smile at a Crocodile: The Shamosuchus are dangerous predators that hunt the young pterosaurs as they learn to fly.
- Stock Animal Behavior: This episode repeats the ever-popular paleoart meme of pterosaurs being preyed on by aquatic reptiles, though in this case it's a crocodile rather than a plesiosaur or mosasaur.
The Austroraptor sequence provides examples of:
- Dark Horse Victory: The young Austroraptor tries to get a fish, but it keeps failing because its older, stronger conspecifics chase it away. Eventually, it finds two Austroraptor adults so engaged in a fight over a fish that they don't notice when the young one sneaks in and steals the fish for itself.
- Fantastic Fauna Counterpart: The Austroraptors, usually solitary predators gathered in one place by a glut of migrating fish, are based on American grizzly bears at a salmon run.
- Hair-Trigger Temper: Adult Austroraptors are shown to be extremely aggressive with trespassers of their feeding grounds and react with violence to those who dare to cross into their territory. The main plot of the segment deals with a young individual trying to take food while avoiding the wrath of the older dromaeosaurs.
The Beelzebufo sequence provides examples of:
- Butt-Monkey: Beelzebufo gets his courtship display interrupted and wrecked by the Rapetosaurs as they roll in the muddy pools he was in, who aren't even aware of his presence, and he bumbles around trying to get to a new spot.
- David Versus Goliath: The Beelzebufo tries to chase off a Rapetosaurus a few thousand times bigger than him.
The Pachycephalosaurus sequence provides examples of:
- Don't Celebrate Just Yet: The young male Pachycephalosaurus should have made sure his rival didn't have a second wind in him before assuming his victory.
- The Exile: The young male ends up expelled from the herd.
- Failed a Spot Check: The young male fails to notice the dominant male getting back up and charging.
- Headbutting Pachy: The segment is all about this trope, where a fight happens in a herd of Pachycephalosaurus.
- Victorious Roar: The Pachycephalosaurus declare their victory in combat by letting out a loud screech. The apparently defeated older male charges at the younger one as he's declaring his victory.
The Tyrannosaurus hunting sequence provides examples of:
- Monster Munch: The Edmontosaurus end up being the victim of two T. rex brothers, though it didn't go down without putting up a fight.
- Terrifying Tyrannosaur: The hunting sequence features T. rex at its most brutal in the series compared to other T. rex sequences that have it eating something that it found already dead or had killed offscreen.
