You are in the floodplains of North Africa, 112 million years ago.

The heat of the Cretaceous sun was relentless, baking the Saharan floodplains into a bright, dusty orange. You crouched behind a thicket of horsetails, your camera ready. You had been tracking a herd of Ouranosaurus for hours, but they moved with a deceptive speed, grazing as they went.

Suddenly, a herd of Nigersaurus emerged from the heat haze. They were bizarre—hardly the terrifying giants you was used to. Only about 30 feet long, these sauropods held their necks relatively low, grazing more like modern cows than the high-browsing Brachiosaurus. One male, no taller than 2 meters at the shoulder, walked directly toward your hiding spot. You were struck by how delicate the skull looked, proportionally tiny compared to its thick, sturdy legs.

But the real shock was its face. It didn't have a conical snout; it was wide, straight-edged, and flat—almost perfectly resembling a vacuum cleaner nozzle. It bent down, its jaw acting as a natural lawnmower. You heard the rhythmic snip-snip-snip of its mouth tearing through low-lying ferns.

As it passed, it raised its head slightly to swallow. You saw them: hundreds of tiny, slender teeth packed into a vertical "conveyor belt" of shearing shears, clicking together as it chewed. There were over 500 teeth in that bizarre snout, constantly being replaced. It was an elegant, if slightly comedic, adaptation for eating close to the ground, a harmless "Mesozoic cow" in a world full of monsters.