A legend about Ryūjin is the story about how the jellyfish lost its bones. This story tells that once, Ryūjin wanted to eat monkey's heart, and sent the jellyfish to get him a monkey. The monkey managed to escape from the jellyfish by telling him that he had put his heart in a jar in the forest, and offered to go and get it. When the jellyfish came back and told Ryūjin what had happened, Ryūjin became so angry that he beat the jellyfish until its bones were all broken.