EoraptorOne of the first dinosaurs, it is the star of the first part of the episode.
- Amazing Technicolor Wildlife: The male has bright blue stripes on his head, while the female has a bright blue 'fin' on her tail.
- Earn Your Happy Ending: While they end up losing most of their clutch, they ultimately outlast the Saurosuchus.
- The Hero: Of the first segment of the episode.
- Mama Bear: Both of the parents are involved in raising their young, as several Probelesodon find out, to their dismay.
- Ridiculously Cute Critter: The hatchling is definitely this, but even the parents manage to be cute.
IschigualastiaA dicynodont, it represents the reptiles that ruled before the dinosaurs, most of which will ultimately die out.
- Laser-Guided Karma: The Saurosuchus ends up meeting his end when a trio of the dicynodonts corners him against a hill.
- Monster Munch: One serves as this for the Saurosuchus.
- Sole Survivor: Of the trio that confronts the Saurosuchus, only one survives. However, only one dicynodont corpse can be seen when they show the aftermath of the battle.
SaurosuchusA rauisuchian, it is the apex predator of the Late Triassic.
- Big Bad: Is this for the first segment, although it isn't evil, just hungry.
- Hungry Menace: The only reason it antagonizes the rest of the cast is out of hunger.
- Laser-Guided Karma: Kills an Ischigualastia in his first appearance; in his final appearance, a trio of the dicynodonts manages to kill him.
- Lightning Bruiser: Unlike Postosuchus, this guy is very fast.
- Pragmatic Villainy: Because of this, it leaves the protagonist Eoraptors alone after the male accidentally throws a Probelesodon into the Saurosuchus's mouth.
- Villainous Valor: Goes out swinging and is confirmed to have taken at least one of his assailants with him.
GiagantoraptorA colossal oviraptorid, and the star of the second segment.
- Amazing Technicolor Wildlife: The males are spectacularly colored.
- Didn't See That Coming: The male was not expecting the ground beneath him to cave in.
- Here We Go Again!: The episode ends with several males beginning their own mating dances, with the focus male hastily moving to restart his.
CryolophosaurusOne of the first large carnivorous dinosaurs, and the focus of the third segment.
- Amazing Technicolor Wildlife: The males are bright orange and yellow, while the females appear to be light blue (the lighting makes it hard to tell).
- Downer Ending: The 'villainous' male succeeds in defeating the heroic one, decides to have his foe's eggs for lunch, claim's his rival's mate as his own, and, as a final insult, rips off the heroic male's crests, ensuring that he will never get the chance to mate again.
- Karma Houdini: The villainous male gets away with all of the suffering he put the heroic one through with only a few scratches from their duel.
- Karma Houdini Warranty: He's swarmed by mosquitos in the final segment, which are still attacking him several hours later.
MosasaurusOne of the largest mosasaurs, and the protagonist of the fourth segment.
- Curbstomp Battle: The sharks didn't even stand a chance.
- Earn Your Happy Ending: Loses most of her brood, but ensures that the last two will be safe from predators for the foreseeable future.
- Mama Bear: Do not mess with her children. Several sharks learn this, to their detriment.
- Monster Is a Mommy: She's introduced while giving birth.
CretoxyrhinaA prehistoric shark.
- Bullying a Dragon: Word of advice: don't eat baby mosasaurs when mommy is around.
- Hungry Menace: The reason they eat the babies.
- One-Hit KO: One of the sharks is disintegrated why the mother attacks him.
- Sole Survivor: Based off the number of sharks shown attacking the babies vs the number the mother kills, it appears that one of the sharks escaped death. Alternatively, it could've been Killed Offscreen.
GlacialosaurusA prosauropod. A male is the protagonist of the fifth and final segment.
- Butt-Monkey: The protagonistic male is this: gets evicted from the herd, finds himself in the sights of the villainous Cryolophosaurus from the third segment, is swarmed by mosquitos, ending up losing his footing on a log and taking a long fall into a muddy lake...
- Earn Your Happy Ending: In the end, though, he survives and is able to not only return to his herd, but become its new leader (the Crylophosaurus chased off the former leader, and his mud-bath protects him from the mosquitos).
- Laser-Guided Karma: The alpha male evicts the heroic male from his harem for trying to woo a female. He ends up being chased off by the villainous Crylophosaurus from the second segment, allowing the heroic male to claim the alpha's harem as his own.
The Watering Hole
Broken JawA male Allosaurus europaeus, and the protagonist of the episode.
- Amazing Technicolor Wildlife: He's green and yellow, with a white stripe on both sides of his head.
- Friendly Enemies: After the Torvosaurus dies, he has this relationship with Woodstock. Probably has something to due with the fact he saved her son.
- Handicapped Bad Ass: Woostock hits him in the face with a Tail Slap, giving him his signature wound. He eventually repays her by biting off the whip end of her tail.
- Seldom-Seen Species: He's the European species A. europaeus, rather than the more famous American species, A. fragilis.
- Stock Dinosaurs: Is an Allosaurus.
- Taught by Experience: When he goes for round two against Woodstock, he makes sure to avoid her tail. In fact, he makes a point of biting it off, so that he'll never have to deal with it again.
- Villainous Rescue: Saves Woodstock's son from the Torvosaurus by biting his throat, though it only does superficial damage. Given that the Torvosaurus had evicted him from his Spot under the tree, it's likely he did it purely for vengeance.
- The Worf Effect: Is easily outmatched by the Torvosaurus. Justified, though: he's much smaller than his foe.
WoodstockA female Dinheirosaurus, and the deurteragonist of the episode.
- Amazing Technicolor Wildlife: Has a bright red neck.
- Big Damn Villains: for a given value of villain, but she is the one to finish off the Torvosaurus, saving Broken Jaw's life in the process.
- Handicapped Bad Ass: Downplayed: Losing the whip end of her tail effectively removes any usefulness it has as a weapon, but she can still crush most predators under her own weight, as the Torvosaurus learns, to his detriment....
- Herbivores Are Friendly: Averted, BIG TIME: she gives Broken Jaw his signature injury because he annoyed her.
- Humiliation Conga: Not only does she lost the whip end of her tail, she ends up getting tipped over by the Torvosaurus. though the ''Torvosaurus'' soon finds out that was a bad idea.
- Laser-Guided Karma: As a juvenile, she shatters Broken Jaw's lower jaw. As an adult, he bites off the whip portion of her tail.
- Logical Weakness: Her whip-like tail is able to break bone with a good strike, but grabbing it close enough to its base will cancel out any force it has. Furthermore, the whip-portion is also easier to break off than the rest of the tail.
- Mama Bear: If you try to eat her son, she will flatten you. The Torvosaurus learns this the hard way.
- Seldom-Seen Species: This series is Dinheirosaurus's first depiction in popular media. However, it serves the same roles as ''Apatosaurus or Diplodocus'', as it is a member of the same family.
- Screw This, I'm Out of Here!: Once the Lusotitan drink the watering hole dry, Woodstock and her herd leave, as they need to go search for more water. She appears to say goodbye to Broken Jaw as she leaves, as does her son.
Woodstock's son.Exactly What It Says on the Tin
- Handicapped Bad Ass: Has an injured foot, making him an easy target for predators. [[spoiler:Still holds his own against the Torvosaurus.
- Amazing Technicolor Wildlife: He's bright yellow.
- Artistic License Paleontology: Rhamphorynchus was a nocturnal coastal hunter, so Ptweety being up during the day and being far from the ocean is rather questionable. He's also lacks pycnofibers.
- Only Friend: Is this to Broken Jaw, tough it's for pragmatic reasons on both ends: Ptweety gets a free lunch, while Broken Jaw gets clean teeth.
- Incredibly Lame Pun: The spelling of his name.
- Sitcom Arch-Nemesis:With Sylvester.
- Shout-Out: To Looney Tunes
- Artistic License Paleotology: Lacks feathers, but this is because of budget reasons. Also, Ornitholestes is only known from North America, but this episode is set in Portugal...
- Butt-Monkey: Cannot hunt successfully at all. To be fair, the only other member of his kind shown in the series ended up losing its heading to Broken Jaw's mom.
- Sitcom Arch-Nemesis: To Ptweety.
- Shown Their Work: Lacks a nasal horn.
TorvosaurusA megalosaur, and the main antagonist of the episode.
- Always a Bigger Fish: The bigger fish in question, he ends up scaring Sylvester into running away, saving Ptweety from becoming an easy meal.
- Butt-Monkey: Although he manages to evict Broken Jaw from his resting spot, he's definitely this overall.
- Monster Munch: An ''entire herd'' of ''Miragaia'' serves as this to him. He ultimately ends up becoming this to Broken Jaw.
- Prehistoric Monster: Deconstructed. He's every bit as loud, violent, and aggressive as one would expect from this trope, but it ultimately works against him. He ends up botching an easy kill because his aggression costs him the element of surprise, he's considered a menace by everyone, to the point theygang up on him, and his attempt to fight Woodstock ends up getting him flattened.
- Stealthy Colossus: Manages to ambush a baby Miragaia without being noticed until the attack happens. Paleo fans everywhere rejoiced at the sight of such an accurate attack.
- The Worf Barrage: His attempt to hunt Woodstock's son ends with him getting killed after everyone gangs up on him. He does manage to knock Woodstock on her side, though.