Dinosaurs: There were harmless herbivores like the massive sauropods, but also dangerous predators like the Tyrannosaurus Rex. However, a tremendous catastrophe wiped out the dinosaurs forever.

Extinct Animals: Since life began on Earth, species have gone extinct and new ones have evolved. But where did life first emerge? What is evolution, and how does it influence the development of species? And why are so many animal species still threatened with extinction today?.