T. rex's long legs were made for marathon walking

Long legs may make good runners, but they
Long legs may make good runners, but they're great for walking, too. Scientists have generally assumed that long-limbed dinosaurs evolved their leggy proportions for speed to catch prey and avoid predators.

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Movies tend to show T-Rex walking and running with alternating feet like an Ostrich. How do scientists know that T-rex didn't hop on two legs moving simultaneously like a kangaroo? - Quora