A large herbivorous dinosaur with a broad, flat bill, also called a 'duck-billed dinosaur,' common in the Late Cretaceous period.
From Greek hadros (thick, bulky) + sauros (lizard). The name refers to these dinosaurs' thick, stocky build, though 'duck-bill' is more commonly used today.
Hadrosaurs were the cattle of the dinosaur world—they traveled in herds, ate plants constantly, and were so successful they dominated most continents until the asteroid hit.
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