Researchers reviewed a group of fossils from an area of the Moroccan Sahara, which includes a host of large dinosaurs, pterosaurs, crocodilians, and other animals.
Among the fossils are three of the largest predatory dinosaurs known to science. These included Carcharodontosaurus—a group that includes dinosaurs with serrated teeth, some of which measured over 40 feet in length—and Deltadromeus, a group of large raptors with long, slender hind limbs.
While this is a dry, arid region today, 100 million years ago when these creatures lived, the area was home to a vast river system with a tropical climate and an abundance of aquatic and terrestrial animals, according to the researchers. Many of these predators likely relied on the numerous fish that filled the waters of this river system.
"There is an enormous freshwater saw shark called Onchopristis with the most fearsome of rostral teeth, they are like barbed daggers, but beautifully shiny."According to the researchers, no comparable modern terrestrial ecosystem exists that is so dominated by large carnivores. In fact, the Kem Kem group contains at least four types of large, predatory dinosaurs, three of which are among the largest dinosaurian predators on record.
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