Hadrosaurs around watering hole, illustration
Illustration of herds of hadrosaurid dinosaurs around a watering hole. In the foreground are two Parasaurolophus sp. (left) dinosaurs grazing and a small group of Corythosaurus sp. (centre) dinosaurs resting. Splashing in the shallow pool behind them are a pair of Lambeosaurus sp. dinosaurs. Hadrosaurids, or duck-billed dinosaurs, were herbivores that lived 86-66 million years ago during the Late Cretaceous., by JOHN SIBBICK / SCIENCE PHOTO LIBRARY
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