You are in the riverbanks of North Africa, 120 million years ago.

The sun beat down on the, then lush, wetlands of what is now the Sahara Desert. From a distance, you spot a small herd of Ouranosaurus, moving slowly along the muddy bank, their distinctive dorsal sails catching the light as they grazed on low-lying ferns by the riverbank.

One of the younger Ouranosaurus approaches the water's edge, and dipped its head to drink. As you continue to watch, the water suddenly erupted.

With a powerful lash of its tail, a massive, 5-foot-long skull lunges forward, the immense pressure of its 18,000-pound-per-square-inch bite force clamping down instantly on the Ouranosaurus’s neck. The herbivore let out a terrified cry, scrambling to gain purchase on the slippery mud, but the reptile had already begun to haul the massive animal down into the depths. The rest of the herd bolted, leaving the unfortunate Ouranosaurus behind.

You had just witnessed a Sarcosuchus in action, much to your disbelief. Moments later, you notice it climbing out of the water near where you are standing, dragging out its now lifeless prize held tightly in its long jaws. Dropping the carcass to the ground, it slowly turns its long snout to face you, a low guttural hiss escaping from its throat, sizing you up…