A new fossil shows a badger-like mammal biting into a dinosaur. A new paper in Scientific Reports describes a fossil of the cat-sized mammal, Repenomamus robustus, locked in "mortal combat" with a Psittacosaurus that was three times as large. The newer fossil has quite a bit of evidence suggesting that the mammal was attacking the dinosaur. "I think the clincher is just the fact that the hind leg of the mammal is trapped within the folded hind leg of the dinosaur," Mallon said. "The question that comes up is, what is a mammal doing attacking a dinosaur that's so much larger than itself?"

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Persons: Jordan Mallon, Michael Skrepnick, Mallon, Han Organizations: Service, Canadian Museum of Nature Locations: Wall, Silicon, China's Liaoning Province