双脚直立行走是非常古老的进化成就,远在鸟类、哺乳动物和人类之前很久,恐龙就率先掌握了这项技能。不过,一块新发现的化石使科学家们得出结论:一种速度很快、体型很小、腿很长的蜥蜴领先恐龙8千万年习得了这一技能,它也因此成了已知最早的直立行走生物。这种蜥蜴化石的残骸在德国的一个采石场被发现,科学家们在那儿花了两年多的时间,费尽九牛二虎之力才把这块10英寸长的易碎化石外面包 Walking upright with your feet is a very ancient evolutionary achievement, long before birds, mammals and humans, the dinosaurs took the lead in this skill. However, a newly discovered fossil has led scientists to conclude that a fast-growing, small-sized, long-legged lizard leading the dinosaur acquired this skill for 80 million years and has therefore become the earliest known Upright walking creatures. The remains of this lizard fossil were discovered in a quarry in Germany and scientists spent more than two years there spending all human and other resources trying to put the 10-inch long friable fossil bag