A mosasaur tooth has been found at one of the most famous Late Cretaceous fossil sites in the world. That means the famous marine predators adapted to a freshwater environment, and it seems they didn’t lose any of their size in the process. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

In 2022, Trissa Ford was digging in the famous Hell Creek, North Dakota, and came across a Tyrannosaurus rex tooth. Exciting as that always is, the tooth was in poor condition, so dig leader Dr Clint Boyd of the North Dakota Geological Survey dug around the tooth in an effort to extract it safely, only to have an even larger tooth fall out.

Aware that the new find wasn’t a T. rex’s dentition, Boyd reported the tooth to marine reptile expert Dr Natha

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