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A detailed view of the Repenomamus skeleton and its stomach contents (the fossil's skull and jaw are not shown). Credit: American Museum of Natural History

Above, a detailed view of the Repenomamus skeleton and its stomach contents (the fossil's skull and jaw are not shown). The boxed area labeled "b" provides a close-up view of the tiny bones of a young Psittacosaurus that were found inside the mammal's stomach. The various Psittacosaurus bones found are identified in the color-coded chart at bottom right.

Credit: American Museum of Natural History

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Return to Story: 'Dog-Sized Mammal Dined on Dinosaurs'