2. How Eating Plants Shaped Life on Land

The first herbivorous vertebrates evolve on the side of the amniote family tree leading to mammals. Alongside them come apex predators, like Dimetrodon. But the Early Permian Period ends in a mystery: is it an extinction event or just a fossil gap?

3. The Rise and Fall of an Ancient Reef

Life in the Middle Permian Period flourished. Gigantic reef complexes stretched for hundreds of kilometers in what’s now the Texas desert, while strange mammal-relatives and huge reptiles thrived on land. But this epoch ends in a crushing extinction.

4. A Tale of Tusks and Saber Teeth

In the Late Permian Period, increasingly mammal-like traits were gradually emerging in our ancient relatives. The first saber-teeth and tusks evolved, and our ancestors, the cynodonts, appeared. And this all happened before the time of the dinosaurs.

5. That Time Almost Everything Died

The Permian Period ended with the biggest mass extinction of all time; more than 80% of species vanished. It altered the course of evolution in ways that we can still feel, 252 million years later. And it was caused by a rapidly changing climate.