The Roc bird is a mythical beast in Chinese traditional mythology, believed to be the largest bird between heaven and earth, with huge wings and strength. It is said that the Roc bird can fly up to 90,000 miles, and one flap of its wings can create a thousand-layered wave, forming great winds and giant waves, and even lifting enormous boulders like mountains. The Roc bird is also seen as a divine creature capable of resolving natural disasters and protecting the people, thus holding a high position and symbolic significance in Chinese culture.

The legend of the Roc bird can be traced back to the "Xiaoyaoyou" section in the book "Zhuangzi," which records a fable about the Roc bird. In the story, the Roc bird flies high in the sky, overlooking the lives of the people. It sees some people cruelly killing animals while eating, feeling extremely sad and angry. It decides to convey moral teachings to humans, warning them not to act cruelly and to respect all life. This story conveys a thought of cherishing life and protecting nature, and has had a positive impact on the formation and development of ancient Chinese culture.

In addition to "Zhuangzi," the legend of the Roc bird is also reflected in many other cultural works. For example, the poem "Changganxing" by the Tang Dynasty poet Li Bai contains the line, "The Roc bird rises with the wind one day, soaring up to 90,000 li," combining the image of the Roc bird with the free-spirited and unrestrained image of the poet, becoming one of the classic literary images.