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The largest dinosaur bone bed in the world may have been the glorious creatures' last stand. Researchers say they can't understand why so many animals gathered in what is today the city of Zhucheng to die. But some 15,000 bones have been found stacked on top of each other in incredible density right at the end of the Cretaceous era, the time when dinosaurs suddenly vanished from the face of the Earth.
The discovery suggests a cataclysm, or perhaps several in succession -- the bones appear to be layered in seven "floors" of sediments, indicating that this may have been the site of serial murders.
Did tsunamis sweep them there? Were they fleeing the ravages of drastic climate change?
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