Snakes have been very present in the folklore of many cultures. But there is a myth that I personally was struck. Is the magic snake’s egg myth. Fossils of regular sea urchins, the group of “cidáridos” generally individuals of the species “Hemicidaris crenularis”. Because of its globular shape and having the surface covered with numerous warts, since ancient times, were interpreted by Celtic people, like real snake eggs, petrified, with magical properties.