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 computer-generated model used for the Dimetrodon hatchlings is actually drastically smaller version of the fully grown Dimetrodon animation, with apparently the same body proportions and color-scheme. So when one of them (the newly hatched animals) is shown climbing up a tree, the viewer is treated to a rather awkward sight, since it looks just like an adult, to which of course it wouldn't be possible to climb up a tree. See more
Petrolacosaurus couldn't have evolved into Edaphosaurus, since it was a diapsid, a reptile that belonged to a completely different animal lineage than Edaphosaurus (a synapsid). 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.