The reptiles evolve, and the race for survival continues on land. Giant arthropods lurk in the Carboniferous forest, and sail-backed mammal-like reptiles fight for the survival of their young in the Permian.
Did You Know?
The amphibian that threatens the Dimetrodon nest, and eventually gets eaten by one of those creatures, is never named in the show. It is a Seymouria. See more
When the amphibians are jumping out of the pond to catch the Meganeura dragonflies, in one shot they aren't reflected in the water. Also, in the closeup shot of a single amphibian jumping, there are actually two separate splash effects layered on top of one another, creating a very bizarre looking splash. See more
Even the air is alien. Over a third is oxygen, much higher than at any time in Earth's history. This oxygen-rich atmosphere has fueled the growth of new, super-sized arthropod predators.