Scenes from scross the island contient of western North America are showcased.
- Book Ends: Like Season One's Coasts, the episode features a T. rex on a beach hunting and a tyrannosaur feeding its babies.
The T. rex and Quetzalcoatlus segment provides examples of:
- Glass Cannon: Quetzalcoatlus is much lighter and frailer than Tyrannosaurus, but its beak can inflict serious injury with one peck and its much faster and more agile than the lumbering theropod. This quality is made even greater when a second Quetzalcoatlus appears on the scene, and their attacks prove too much for T. rex to tolerate.
- Know When to Fold 'Em: The T. rex, harrassed by a duo of Quetzalcoatlus, eventually gives up the fight and leaves the carcass it was feeding on to the pterosaurs.
- Life Will Kill You: The old Alamosaurus, far too big for any predator to be killed, dies of old age, lying down on the beach to never get up again, providing a feast for carnivores.
- Peaceful in Death: When the old male Alamosaurus passes, he just slowly lies down as if he has made peace with his fate.
- Plot-Triggering Death: The story of this segment focuses on the corpse of a recently-dead Alamosaurus being fought over by scavengers.
- The Rival: It's implied that T.rex and Quetzalcoatlus regularly come to blows over scavenging privileges. This makes sense since Quetzalcoatlus is the only carnivore known in T. Rex's range that isn't another T. Rex big enough to reasonably challenge one.
The Western Interior Seaway segment provides examples of:
The Pectinodon segment provides examples of:
- It Can Think: As fitting for troodontids, the baby Pectinodon's quickly figure out that running into the swarm of brine flies with their mouths open is the most effective way to catch them.
The Triceratops segment provides examples of:
- Curb-Stomp Battle: The duel between males is a decidedly one-sided affair in favor of the older male, whose brow horns are not only longer and thicker than his younger opponent, he outweighs the younger male by four tons and has far more fighting experience.
- Dented Iron: The old male is covered in scars that mark him as an experienced combatant, including a snapped brow horn, a broken epijugal horn, and a chunk of frill missing.
- Old Master: An older, battle-scarred male is one of the two main players in this segment. Unsurprisingly, he curb-stomps his younger rival.
- "Ray of Hope" Ending: The young male's perfect horns are ruined by older male during a fight, ensuring that he will not have any chance of attracting females in the current mating season. But David Attenborough notes that this may have been a blessing for next mating season since the young male's horns will heal and this time, it will have attractive battle scars to impress females of his fighting experience.
- Strong and Skilled: David Attenborough notes that the older male Triceratops knows how to use his superior size and strength against his younger, inexperienced and relatively smaller opponent when fighting during the Triceratop's mating season.
- Stronger with Age: Triceratops are depicted as continuing to grow larger as they age, with a thirty year-old male weighing over ten tons and with massive brow horns, on top of the experience to use his strength effectively in battle.
- Temper-Ceratops: Unlike the more plavid depiction scene, the segment highlights the aggressive intraspecific interactions of male Triceratops during their mating season.
The Nanuqsaurus and Ornithomimus segment provides examples of:
- Book Ends: The episode, and by extension the series ends with a segment with a tyrannosaur and its offspring.
