Ouranosaurus, a north African iguanodont with a tall spinal ridge along its back. - stock illustration

Ouranosaurus, a north African iguanodont with a tall spinal ridge along its back. They were about 23-27 feet long and were likely prey for the giant 40 feet long crocodile Sarcosuchus and the land predator Carcharodontosaurus (a close relative of Gignotosaurus). They roamed forests and riverways of north Africa about 100-96 million years ago.