Not all two-legged dinosaurs were like the lumbering Tyrannosaurus rex. An analysis of dinosaur tracks from 120 million years ago unearthed in Spain adds to growing evidence that.
About 100 million years ago, a pair of 5-metre-long predatory dinosaurs – possibly spinosaurs or carcharodontosaurs – ran at speeds of up to 45 kilometres per hour as they chased down prey in what is now northern Spain