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Dinosaur Zoom In 5

Is It a Bird? Is It a Cow?
Art by Mark Hallett

No, it's Corythosaurus. With a beak and teeth, this "helmet lizard" could really chew up the scenery. Its beak worked a bit like pinking shears, with grooves and ridges on the upper and lower parts sliding past each other to crop vegetation. Then great dental batteries—hundreds of teeth packed together to form a giant "molar"—took over the grinding. These bipedal, four-ton (four-metric-ton) creatures may have grazed on the ferns, magnolias, and palms that covered western North America 75 million years ago.






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