Mammals may have hunted down dinosaurs for dinner, rare fossil suggests

This image shows entangled dinosaur and mammal skeletons with details of their interaction. The scale bar equals 10 cm. (Gang Han/Canadian Museum of Nature via AP)

NEW YORK — An unusual find in China suggests some early mammals may have hunted dinosaur for dinner.

The fossil shows a badgerlike creature chomping down on a small, beaked dinosaur, their skeletons intertwined. The find comes from a site known as “China’s Pompeii,” where mud and debris from long-ago volcanoes buried creatures in their tracks.

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“It does seem like this is a prehistoric hunt, captured in stone, like a freeze frame,” University of Edinburgh paleontologist Steve Brusatte, who was not involved with the study, said in an email.

The fossil, described Tuesday in the journal Scientific Reports, shows two creatures from around 125 million years ago, during the Cretaceous period.

Even though the mammal is much smaller, researchers think it was attacking the dinosaur when they both got caught in the volcanic flow, said study author Jordan Mallon, a paleobiologist at the Canadian Museum of Nature. The mammal is perched on the dinosaur, its paws gripping the reptile’s jaw and a hind limb while its teeth plunge into the ribcage.

“I’ve never seen a fossil like this before,” Mallon said.

That mammals ate dinosaur meat had been proposed before: another fossil showed a mammal died with dinosaur remains in its gut. But the new find also suggests that mammals may have actually preyed on dinosaurs several times their size, and didn’t just scavenge ones that were already dead, Mallon said.

“This turns the old story on its head,” Brusatte said. “We’re used to thinking of the Age of Dinosaurs as a time when dinosaurs ruled the world, and the tiny mammals cowered in the shadows.”

The mammal in the fossil duo is the meat-eating Repenomamus robustus, about the size of a house cat, Mallon said. The dinosaur — Psittacosaurus lujiatunensis — was about as big as a medium-sized dog with a parrotlike beak.

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