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According to a Japanese Materia medica, he was almost close to a man, in addition to chin hair and eyebrows, between the fingers and limbs is a description of some skin. He ate food and drank but never spoke.
According to Nagasaki's records, in addition to these features, there was probably a Hakama and a flap of skin around the waist, and could live for only a few days on the ground, after coming up from the sea. One theory suggests that it was a Sea lion or seal.