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Dinosaur Evolution and Extinction

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How did dinosaurs evolve from earlier reptiles, and how did different types of dinosaurs adapt to new ecological niches? Just as important, why did the dinosaurs become extinct 65 million years ago?
  1. Dinosaur Evolution
  2. Dinosaur Extinction

Dinosaur Evolution

The origin of dinosaurs, the geological periods in which they lived, and facts (and theories) about dinosaur evolution.

Dinosaur Extinction

Why did the dinosaurs suddenly become extinct 65 million years ago? Here are the leading theories about what paleontologists call the K/T Extinction Event.

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