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基于孔子鸟（Confuciusornis）股骨骨骼的微观组织结构与现生鸟类的相似性，认为孔子鸟具有较高而恒定的生长率，其新陈代谢可能已进化到相当高的水平，这种较高的代谢水平的起源要晚于鸟类的系统起源．鸟类骨骼内部的组织结构特征与骨骼外部的形态特征的进化是不同步的。孔子鸟等的祖先类型应是一生长速率较低而不恒定的、较原始的爬行动物。
Based on the similarity of the microstructure of Confuciusornis femur bones to the existing birds, it is believed that Confucius birds have a high and constant growth rate and their metabolism may have evolved to a rather high level The origin of the level later than the systematic origin of birds. The structural features of the internal structure of bird skeletons and the evolution of the morphological features outside the skeleton are not synchronized. The ancestral types of Confucius and other birds should be a relatively low growth rate and not constant, more primitive reptiles.