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Chapter 4: In Cold Blood

October 25, 2023

After Earth’s third mass extinction, mammals’ surviving ancestors ruled the supercontinent Pangea. But lizards soon ushered in the age of reptiles.

Life on Our Planet – 1×4
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Chapter 1: The Rules of Life

Evolution. Competition. Mass extinction. Three fundamental rules have driven the rise and fall of life on Earth for over four billion years.
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Chapter 2: The First Frontier

For billions of years, land on Earth was uninhabitable. But in the seas, predation allowed species to thrive before — and after — two mass extinctions.
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Chapter 3: Invaders of the Land

Sprawling moss, towering trees, flying insects, limbed amphibians: Early species vied for domination as the land went from hostile to hospitable.
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Chapter 4: In Cold Blood

After Earth's third mass extinction, mammals' surviving ancestors ruled the supercontinent Pangea. But lizards soon ushered in the age of reptiles.
Life on Our Planet – 1×4
Life on Our Planet – 1×4
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Chapter 5: In the Shadow of Giants

The formation of continents with varied environments allowed for an explosion of biodiversity — and turbo-charged the evolution of mighty dinosaurs.
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Chapter 6: Out of the Ashes

The dinosaurs met their end with a cataclysmic asteroid impact. Rising from the ashes, birds reinvented themselves into a dynasty 10,000 species strong.
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Chapter 7: Inheriting the Earth

Emerging from the dinosaurs' shadows, mammals went from underdogs to global power, with game-changing adaptations that would conquer land, air and sea.
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Chapter 8: Age of Ice and Fire

As the Ice Age thawed, humans rose above the rest. But the possibility of a sixth mass extinction now looms: Has our ingenuity caused our downfall?
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