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Dinosaurs only started to live large after a mass extinction altered the planet in their favor. Lucas Atwell CC BY-SA 3.0 Everyone knows about the mass extinction that ended the Age of Dinosaurs.

Where they lived: Dinosaur fossils have been found on every continent, including Antarctica. What they ate: Some ate plants, while others ate animals, including other dinosaurs. How big they were: The ...

Texas-based "de-extinction" startup Colossal Laboratories & Biosciences have supposedly revived the long-extinct dire wolf. While excitement builds about the $10 billion startup's news, experts say ...