There’s nothing like a size comparison of stuff from fictional universes to help develop a better sense of their scale. Knowing how big Arrakis from Dune is relative to Pandora from Avatar, for ...

Editor’s Note: Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Very large things often have small ...

Thunder beasts were among the first mammals to truly live large. The biggest of these rhino-like creatures, called brontotheres by experts, stood taller than eight feet at the shoulder and weighed ...

Scientists have used a combination of ancient fossil remains and the scans of a great white shark to create a 3D model of a prehistoric megalodon. Armed with this model, the researchers figured out ...

History is full of terrifying beasts that would make even the most ferocious living predators look like cuddly toys. There's the largest prehistoric arthropod, as well as the the giant eagle that ...

Paleoartist Roman Uchytel has created a gallery of size-comparison images that highlight the radical evolutionary journey that modern day animals have undergone when compared to their long-extinct ...