Creatures that live in cold environments of many kinds during the Maastrichtian are featured.
Recurring tropes are:
- Social Ornithopod: Most of the Hadrosaurs are seen in herds, and even those that aren't are in pairs.
The dromaeosaurs hunting hadrosaurs segment provides examples of:
- Animal Stampede: Invoked by the dromaeosaurs, who provoke a stampede of hadrosaurs across a frozen river instead of attacking them directly, so they can scavenge on the ones who drown.
The Ornithomimus segment provides examples of:
- Goofy Feathered Dinosaur: The Ornithomimus are presented in a comical light, stealing branches from each other to build their nests.
The Olorotitan segment provides examples of:
- Mosquito Miscreants: The baby Olorotitan gets swarmed and nearly killed by mosquitos.
The arctic troodontid segment provides examples of:
- It Can Think: Downplayed, as its intelligence is still animal-like, but the segment still goes out of its way to showcase that troodontids are smarter than the average dinosaur. The one in the episode uses fire to flush out its prey.
The Antarctopelta segment provides examples of:
- Bioluminescence Is Cool: The Antarctopelta finds a cavern that is also the home for glowing fungus gnat larvae, who make the cave's ceiling look like a starry sky.
- Coming of Age Story: The prehistoric equivalent of one. The main plot of the episode deals with a teen Antarctopelta searching for a new home and fending off for himself after his previous group splits up.
The Pachyrhinosaurus herd vs Nanuqsaurus trio segment provides examples of:
- Fantastic Fauna Counterpart: Both Pachyrhinosaurus and Nanuqsaurus have their behaviour taken from modern Arctic animals. The first is based on a musk-ox, being a big herd animal that fights for females by butting their head with the rival and their method of protecting their young by having the adults forming a protective circle while the young dinosaurs remain in the center is taken straight from the same method musk-oxes employ in the present. The Nanuqsaurus meanwhile evokes an Arctic wolf (the main predator of the musk-ox) by being a social hunter with a feathery coat resembling fur and emitting some howl-like sounds that are unmistakably wolf-like.
- Temper-Ceratops: The Pachyrhinosaurus can be aggressive and violent during the mating season and when they feel threatened, as one of the Nanuqsaurus finds the hard way.
- Terrible Trio: Three Nanuqsaurus appear as the main antagonists of the segment, stalking the Pachyrhinosaurus herd in the middle of a blizzard.
- Terrifying Tyrannosaur: The Nanuqsaurus are portrayed as pacient, efficient and social predators menacing the herd of Pachyrhinosaurus through the segment, in contrast to the T. rex and Tarbosaurus who were shown in a more chill light in previous episodes. The eventually succeed in taking down a bull Pachyrhinosaurus by the end of the episode.
