Prehistoric watering hole. Computer artwork of three Ouranosaurus dinosaurs drinking at a watering hole during the early Cretaceous period (about 110 million years ago) in what is now Africa. A Sarcosuchus (lower left) floats nearby waiting to strike. The arid landscape is studded with prickly juniper (Juniperus oxycedrus) and conifer trees. Ouranosaurus was a variety of Iguanodont, a group of large plant-eating dinosaurs that included the well-known hadrosaurs (duck-billed dinosaurs). Sarcosuchus is an extinct genus of crocodilian reptile and a distant relative of today's crocodiles.