The carcharodontosaurids were a group of giant carnivorous dinosaurs that rivalled and even exceeded Tyrannosaurus in size. Scientists have calculated that one of them, Giganotosaurus, could run at 50 km/h, which is just slower than an ostrich, but 13 km/h faster than a gold medal-winning Olympic sprinter. Carcharodontosaurids were top predators in the ancient continent of Gondwanaland: the area of the world that's now the southern hemisphere continents - South America, Africa, Antarctica, Australia - and India. They evolved from an Allosaurus-like ancestor and became extinct about 89 million years ago.
Scientific name: Carcharodontosauridae
The world's largest mega carnivore dinosaurs lived alongside even more immense plant eaters.
Dr Rodolpho Coria of Plaza Huincul Museum and Dr Fernando Novas of Argentina Museum of Natural Sciences have uncovered giant dinosaurs in Patagonia. In this clip, originally shown in 2000, Dr Mark Norell of the American Museum of Natural History discusses their finds.
A new species of huge, meat-eating dinosaur is uncovered in Patagonia, and it's not alone.
This programme was originally shown in 2000. Since then, the dinosaur in the video clip has been given the name Mapusaurus.
Discover what these behaviours are and how different plants and animals use them.
Additional data source: Animal Diversity Web
Discover the other animals and plants that lived during the following geological time periods.