Description：
恐龙长相具有独特之处，肱骨有低矮的三角嵴，长度约是肱骨的1/3到1/2，肠骨后部有个突出区块，胫骨末端边缘宽广，有个往后的凸缘，距骨有个明显上突，与胫骨契合。恐龙具有直立步态，而大部分其它爬行动物则是四肢往两侧延展的步态。恐龙体型也很特别，一般体型都很大，其中蜥脚类恐龙是其中巨无霸。特别是最大蜥脚类恐龙比任何动物都要大出几个等级，但大部分恐龙要比大型蜥脚类恐龙小得多。在漫长的恐龙时代，即使体型最小的蜥脚类恐龙，也比它们栖息地内的其它动物要大。恐龙种类有很多，大概有1000种以上，但是根据臀部结构的不
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