The siren is a deadly creature, half human, half bird or fish. Early sources say the siren is human (always female) from the head to the navel, and bird from the waist down. Later sources say that the siren is fish from the waist down, like a mermaid. The story of the sirens shows that those who take delight in worldly pleasures will become the devil's prey.Sirens charm men with their beautiful singing. Sailors who are attracted to the singing fall asleep; the sirens then attack the men and tear their flesh. They sing when it is stormy but weep when the weather is fair.