Some dinosaurs danced and literally shook their tail feathers to attract potential mates, researchers say. It’s long been theorized that at least some feathered dinosaurs used their plumage for courtship. A new study, published in the journal Acta Palaeontologica Polonica, strengthens that belief. The dancing, prancing dinosaurs were oviraptors — two legged, plant-eating dinos, related to T. rex, that roamed parts of China, Mongolia and Alberta during the Cretaceous period, which was the final age of the dinosaur.