Not only Sumerians and China people, all ancient civilizations have similar creatures, such as Anubis, the head of the wolf in Egypt, Omik, Maya and Quetzalcoatl in Aztec, Nuwa in Fuxi, China, and scorpion and lion in two river basins. . Many people think that Shan Hai Jing is not just a fantastic book, but an encyclopedia of geography in ancient times when human civilization was uncivilized. Those creatures also exist, perhaps without such exaggerated appearance, but in the chaotic times, human beings' understanding ability is incompetent, coupled with the fear of nature, which links wild animals with the natural climate and even sickness and death. Through word of mouth, from generation to generation, it has increased a lot of subjectivity and exaggeration, and finally formed these fairy tales that you see now.
Of course, some people think that perhaps the extremely advanced extraterrestrial civilization visited and helped mankind to develop wisdom and used fire and tools, and this theory is consistent with Greek mythology and the Bible. The aliens left after completing their mission, so only totem rock paintings and ancient myths and legends have been handed down, but no one has ever seen or excavated evidence. In fact, many sci-fi and fantasy works have borrowed these theories, such as Fuxi Nuwa, the Queen Mother of the West and the mystery of eternal life mentioned in the famous novel Tomb Raider Notes. . The general ancestor mentioned in the mass effect.