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

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