Uploaded December 2025 | Updated September 2026, 2 weeks ago

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Prehistoric mammals evolved and diversified to become powerful predators and carnivores after the nonavian dinosaurs went extinct. The apex predators of the Cenozoic Era include saber-tooth cats like Panthera atrox, huge whale and hippo relatives like Andrewsarchus, and bone-crushing hyaenodonts like Megistotherium. This video discusses the fascinating life history and body size of the biggest mammalian land carnivores ever, starting small and working up towards carnivores that dwarf those found today.

Thumbnail art by Mauricio Anton & Mario Lanzas. Soundtrack is "Sabertooth" by Paleowolf.