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When bipedal dinosaurs walked, they probably strode with a swagger, swishing their tails up and down for the same reason humans swing their arms when they walk.

Traditionally, dinosaur tails have been seen as a counterbalance for the weight of a dinosaur’s head. But and Peter Bishop at the Royal Veterinary College in London say the tail probably played a more active role in a dinosaur’s gait. With every step, the tail would swing up and down to regulate the dinosaur’s angular momentum and increase its walking efficiency.

This comes from a computer simulation of …