About 66 million years ago, a herd of herbivorous dinosaurs succumbed to drought – tragically, just hours or days before heavy rains fell.

We know this because they left some of the most incredibly well-preserved dinosaur 'mummies' ever found, consisting of clay molds of features such as skin, spikes, and the first known example of hooves in a reptile.

These mummies belonged to a species called Edmontosaurus annectens , duck-billed herbivores that roamed what's now North America like ancient buffalo. They're among the dinosaurs we know the most about, because they're quite common and often preserve well.

Paleontologists at the University of Chicago have now led a study closely examining several dinosaur mummies from the 'mummy zone', a 10-kilometer-wide region in the US state of

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