The film revolves around the lives of North American dinosaurs in the late Cretaceous period, through the eyes of an early mammal trying to survive.
The NFB has made the short available on their official Youtube channel.
The film provides examples of:
- Anachronism Stew: If we're to take the short's title at face value, then it places the date of the Cretaceous-Paleogene extinction event a full one to two million years after it occurred in Real Life. On the other hand, all species in the short are from Maastrichtian North America.
- End of an Era: As the dinosaurs die off, the mammal emerges to dominate the Earth.
- "Everybody Dies" Ending: This being the end of the Cretaceous period, only the mammal is left standing by the end of the film.
- Evil Egg Eater: An Ornithomimus is caught eating eggs by a mother Triceratops, who proceeds to violently impale it with her horn.
- Family-Unfriendly Death: Despite being aimed at children, the short contains some surprisingly violent scenes.
- First, when the mother Triceratops catches the Ornithomimus eating her eggs, she impales it on her horn. The poor creature screams and writhes in agony as it dies, at which point the Triceratops scrapes the corpse off.
- Later, after failing to takes down an Ankylosaurus and a mother Triceratops, the Tyrannosaurus bites and suffocates an Edmontosaurus, though the actual eating is cut away from.
- Gory Discretion Shot: While the actual killing is shown in all its glory, the scene fades to black before the Tyrannosaurus can actually start eating the Edmontosaurus.
- Last of His Kind: At the very end, we see the death of the last Tyrannosaurus as the dinosaurs succumb to extinction.
- Mama Bear:
- The mother Triceratops not only successfully fights of a Tyrannosaurus attack, but she also kills an Ornithomimus trying to eat her eggs (the mammal avoids the same fate by scurrying off before she can be spotted).
- The mammal has to survive not only for herself, but her offspring as well.
- Meek Mesozoic Mammal: The documentary short centres around a primitive mammal surviving at the end of the Late Cretaceous. Even the smallest dinosaur shown, the Ornithomimus is a threat to it, and the narrator states how the dominance of the dinosaurs prevents mammals from growing larger or diversifying beyond tiny insect-eaters cowering in their shadows.
- Temper-Ceratops: The mother Triceratops kills the Ornithomimus for attacking her nest and battles the Tyrannosaurus.