Before the Dinosaurs
Towards
the start of the Permian Period, about 300 million years ago, the earth's
climate gradually became hotter and drier. This conditions became favored
by small reptiles. When we compare amphibians to reptiles we find that
the reptiles were better at regulating their own body temperature, laid
their eggs on land, and did not need to stay close to bodies of water.
These reptiles evolved and adapted to various ecological niches. The amphibians
did not go away, they are still with us, but the reptiles became the dominant
group.