James George FRAZER categorized stories of origins of death, he divided them into the 'snakes and molting' group, which is related to animals such as snakes that molt, and the 'getsu eikyo' (waxing and waning of the moon) group that considers a connection between the waning and waxing of the moon and death in humans.
ジェームズ・フレイザーは死の由来話を分類して、蛇など脱尾する動物にからむ「蛇と脱尾（脱皮？）」型と、月の満ち欠けを人の死の由来を結びつけて考えた「月盈虚」型に分けている。