Photo credit: Rodolfo Coria and National Geographic

All the better to eat you with! At least that's what carnivorous Mapusaurus roseae might say if you were ever to hop in your TARDIS and have a chat with this newly discovered dinosaur species which has supplanted both Giganotosaurus and Tyrannosaurus Rex as the world's largest known dino. Over 12.5 meters (40 feet!) long, Mapusaurus is thought to have lived around 100,000,000 years ago. Seven, possibly more, of these ancient beasts' bones were found in a mass grave in western Patagonia, in the foothills of the Andes mountains. The find adds to the mounting evidence that meat eating dinos lived in groups and were not solitary predators as was previously thought. More at National Geographic and a gallery of Mapusaurus photos at ABC News.

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