Dinosaur Evolution

How Did Dinosaurs Evolve?
Like all living creatures, dinosaurs evolved from preexisting ancestors. Here's an overview of current thinking about dino evolution.

The First Dinosaurs
Some time in the middle to late Triassic period, about 230 million years ago, the first true dinosaurs evolved from their archosaur ancestors. Here's everything you need to know about these early theropods.

How Dinosaurs Are Classified
How do paleontologists classify long-extinct dinosaurs? Here’s a quick guide to the major orders, suborders and infraorders of dinos, according to the state of current research.

Why Were Dinosaurs So Big?
Species by species, individual by individual, dinosaurs were bigger than any other land-dwelling animals that ever lived. Here are some theories that just might account for dino gigantism.

Dinosaurs and Creationists
Creationists don't believe in evolution, and insist that the earth is only a few thousand years old. How do dinosaurs fit in their world view?