JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
Hadrosaur head. Computer illustration of the head of a hadrosaur dinosaur, showing its crest. Hadrosaurs (duck-billed dinosaurs) were common herbivores during the Late Cretaceous period (around 100 to 66 million years ago) in what is now Asia, Europe, Antarctica, South America, and North America.
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