For the first time ever, we’ve been able to prove that some dinosaurs had hooves, thanks to two remarkably well-preserved mummified dinosaurs retrieved from Wyoming’s Badlands. The specimens are the duck-billed dinosaurs E dmontosaurus annectens that, thanks to a "fluke preservation event" are near-perfect 66 million years later. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Known as “clay templating,” that process essentially encased the dinosaurs shortly after burial with a mask of clay no thicker than 1/100th of an inch, or about 0.3 millimeters. “This is a mask, a template, a clay layer so thin you could blow it away,” said senior author Paul Sereno, PhD, Professor of Organismal Biology and Anatomy at UChicago in a state

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