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Researchers: ‘Parrot Dinosaur’ learned to walk upright like human child

'Parrot dinosaur' walked on all fours, then graduated to two (+video) (via The Christian Science Monitor) A baby in a dinosaur costume can do a laudable imitation of how a young dinosaur might have behaved. New research suggests that Psittacosaurus, the ‘parrot dinosaur,’ walked on four feet – and then…