足迹显示两腿恐龙是敏捷的

　　13 December 2021
　　西班牙出土的恐龙足迹的最新研究及越来越多证据显示出土恐龙与霸王龙的基因类似是敏捷的。霸王龙是体型庞大的，吃不敏捷小恐龙的食肉恐龙。
　　该发现登在12月9日自然科学的科技报道中。这一发现宣告恐龙化石足迹能证明恐龙运动快。
　　在美国德州和犹他州发现这种恐龙足迹运动速度是48千米每小时以上，而在西班牙发现的是约45千米每小时。
　　据脚印的长，推出腿高，及相同脚印间距离计算速度。
　　研究人员估计最新发现足迹的恐龙长是4－5米，高是1.5－2米。
　　科学家认为刚发现的恐龙可能是最快的恐龙，脚印一个接一个。
　　学者认为行为学很难研究恐龙，这些发现对于知识进化很重要。
　　通常科学家预测恐龙行为是通过动物运动用计算机建模。测试恐龙化石脚印来确认结果。
　　New research on dinosaur footprints unearthed in Spain adds to growing evidence that a dinosaur that was genetically similar to the Tyrannosaurus rex was extremely agile. The Tyrannosaurus rex was a very large meat-eating dinosaurs that was not agile.
　　The findings were published on December 9 in ＂Scientific Reports,＂ which covers natural sciences. The findings announced the existence of sets of fossilized dinosaur footprints that prove the dinosaur could move quickly.
　　These footprints join other sets found in Utah and Texas. One of the sets there shows dinosaurs running at speeds over 48 kph. The Spanish footprints showed speeds of nearly 45 kph.
　　To figure out the running speed, scientists measured the length of the footprints and then considered the height of the place where the dinosaur＂s legs meet the body, or the hip. They also needed to consider the distance between one footprint and another on the same footprint.
　　The researchers estimated that the animal that created the most recent set of footprints was probably 1.5 to 2 meters tall and 4 to 5 meters long from mouth to tail.
　　Scientists think there may be faster dinosaurs, but these footprints have been easier to find. The footprints are known as tracks when there are one or more long sets.
　　＂Behavior is something very difficult to study in dinosaurs,＂ said lead writer Pablo Navarro-Lorbés of the University of La Rioja. ＂These kind of findings are very important, I think, for improving that kind of knowledge.＂
　　Scientists usually predict dinosaur behavior through computer modeling of the animals＂ movement. Physical examination of fossilized footprints confirmed the results.