In My Day, While We Were Slogging to School Uphill, Both Ways, Through 5-Foot Drifts

We knew about three different kinds of dinosaurs, and we liked it. A scientist recently unveiled a new discovery:

Nigersaurus sported an almost perfectly squared-off jaw lined with 128 uniform front teeth, the only kind of teeth it had. When the creature closed its mouth, the rows would have joined perfectly to snip plants that the dinosaur ate.

"In modern mammals, when you see broad muzzles, you know that they are animals are grazers that eat grass, like cattle," said Sereno. "When they have narrow, pointy snouts, you know they are browsers, animals that feed on leaves and bark they pull from trees and bushes, like giraffes.

"This thing was a Mesozoic cow."