[1/3] Fossilized skeletons dating to about 125 million years ago from China showing the entanglement of the dinosaur Psittacosaurus lujiatunensis and the mammal Repenomamus robustus are seen in this 2022 handout photograph. A dramatic fossil unearthed in northeastern China shows a pugnacious badger-like mammal in the act of attacking a plant-eating dinosaur, mounting its prey and sinking its teeth into its victim's ribs about 125 million years ago, scientists said on Tuesday. Dating to the Cretaceous Period, it shows the four-legged mammal Repenomamus robustus - the size of a domestic cat - ferociously entangled with the beaked two-legged dinosaur Psittacosaurus lujiatunensis - as big as a medium-sized dog. "Here, we have good evidence for a smaller mammal preying on a larger dinosaur, which is not something we would have guessed without this fossil," Mallon added. The researchers discounted the idea that the Repenomamus and Psittacosaurus fossil showed a mammal merely scavenging a carcass.

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Persons: Read, paleobiologist Jordan Mallon, Mallon, Xiao, chun Wu, Psittacosaurus, Repenomamus, Will Dunham, Rosalba O'Brien Organizations: dinos, Canadian Museum of Nature, Thomson Locations: China, WASHINGTON, Ottawa, Liaoning Province, Mongolia