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South America* //Cretaceous (110 million years ago) // Saurischia //image source

Fun Fact: Irritator is related to the much larger, much more famous Spinosaurus. It is so named because paleontologists were “irritated” that the skull they acquired had been altered by fossil dealers. The sail is thought to help the animal regulate its body temperature.

_{*It is a common misconception that all dinosaurs lived in the combined land mass Pangaea. However, by the Cretaceous period, the continents had already drifted apart.}