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Were dinosaurs real?

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Sixty-five million years ago, the last of the non-avian dinosaurs went extinct. So too did the giant ... In all, more than half of the world's species were obliterated. ... Some scientists think both may have contributed to the extinction, and others suggest the real cause was a more gradual shift in climate and changing sea levels. read more

While dinosaurs were ancestrally bipedal, many extinct groups included quadrupedal species, and some were able to shift between these stances. read more

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