Life on Our Planet — Season 1, Episode 4: Chapter 4: In Cold Blood

Episode synopsis

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

About Life on Our Planet

Life's extraordinary journey to conquer, adapt and survive on Earth across billions of years comes alive in this groundbreaking nature docuseries.

More episodes from Season 1

• E1Chapter 1: The Rules of Life
• E2Chapter 2: The First Frontier
• E3Chapter 3: Invaders of the Land
• E5Chapter 5: In the Shadow of Giants
• E6Chapter 6: Out of the Ashes
• E7Chapter 7: Inheriting the Earth
• E8Chapter 8: Age of Ice and Fire