Saurolophus osborni

Saurolophus osborni roamed the river floodplains and coastal wetlands of Late Cretaceous North America, cropping tough foliage with its broad beak and dental battery of hundreds of tightly packed teeth. A distinctive rod-like spike of solid bone extended backward from its skull, likely anchoring an inflatable soft-tissue flap used for social signaling. Fossilized skin impressions demonstrate that its hide featured uniform rows of small, non-overlapping scales along its flank and muscular tail.