Speculative Paleontology: Theropods vs. Cenozoic Mammals (Africa)

Introduction

• Post-dinosaur extinction: Mammals diversified and took over as large vertebrates.
• Series premise: How would Cenozoic mammals adapt to the return of giant theropods?
• Focus: Africa.

Dinosaurs Team

• Vitosaurus: Smaller theropod, high-spined, 1-2 tons.
• Afrovenator: Megalosaur, smaller but larger than modern lions.
• Chenanisaurus & Cryptops: Medium to large speedsters.
• Catosaurus: Bruiser, 4 tons.
• Saurnops: Large but fragmentary.
• Spinosaurus: Iconic fisher giant.
• Kronosaurus: Apex predator, designed for killing.

Epochs Analysis

Paleocene (66-56 million years ago)

• Global temperature: 24-25°C, recovery from asteroid strike.
• Fauna: Small shrew-sized mammals, insectivores, small crocodilians.
• Theropod survival strategy: Predating on smaller animals.
• Result: Smaller theropods become dominant, giants struggle.

Eocene (56-34 million years ago)

• Global temperature: 28°C.
• Fauna: Huge snake (Gigantus), small primates, small proboscideans and titanohyrax (600-1300 kg).
• Theropod strategy: Predating on larger herbivores with minimal resistance.
• Result: Theropods clear level easily, dominate rivers and land.

Miocene (23-5 million years ago)

• Fauna: Hyenas, bear dogs, large cats, elephant relatives (Ellantodon and Arambeladon).
• Theropod strategy: Predating on large mammals; Spinosaurus faced competition from long-snouted crocodilians.
• Result: Theropods, especially Kronosaurus, dominate thanks to adaptations for large prey.

Pliocene (5-2.6 million years ago)

• Fauna: Hominins (Australopithecus), giant pigs, impalas, hippos, rhinos, giraffids.
• Theropod strategy: Medium and large theropods predate medium and large prey; Spinosaurus rules aquatic environments.
• Result: Smaller humanoid and mammalian species hide or are preyed upon.

Pleistocene (2.6 million-11,000 years ago)

• Climate: Initial warmth with later cooling periods (Ice Ages).
• Fauna: Modern and prehistoric animals, hippos, giraffes, elephants, early human species (Homo habilis and Homo erectus).
• Homo erectus: Development of tools, fire, organized hunting groups.
• Theropod strategy: Utilize size and speed; significant threat to early humans.
• Result: Despite human advancements, theropods dominate; humans become isolated.

Conclusion

• Theropods, due to their size, speed, and adaptability, would likely dominate Cenozoic Africa in any epoch.
• Mammals were not equipped to handle such apex predators, leading to drastic ecological changes.
• Even advanced early humans would struggle against these ancient predators.

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