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Prosaurolophus was a saurolophine hadrosaur that had given up its amateur status…I mean, it lived in the Late Cretaceous of Alberta and Montana, roughly 75 million years ago. Prosaurolophus bore a short, solid crest that rose as a low bony ridge in front of the eyes, along with the grinding tooth batteries typical of hadrosaurs.
Hadrosaurs were capable of both two-legged and four-legged locomotion (both are depicted here), although two-legged walking was probably reserved for reaching tasty-looking vegetation up high, surveying the landscape or potentially for display or intimidation. When headed somewhere they would have been more stable and potentially more efficient walking on four limbs, and when trying to escape from a hungry theropod they would be far more maneuverable trying to escape on four legs, which would have been their primary advantage when fleeing from faster-but-slower-turning theropod predators.
Alternative bipedal gait
