Some Dinos May Have Wagged Their Tails While Running

Small-armed, two-legged dinosaurs may have wagged their tails to help them run, for the same reason humans swing their arms, according to a new study.

Figuring out how extinct species moved about in the world is not easy, as just bones and footprints are left to analyze. Most previous studies on bipedal dinosaurs — those that stand on two feet, such as Tyrannosaurus rexhave deduced movement by focusing on the animals' legs.

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