The mythical mermaid has the head, arms, and torso of a young woman, and the tail of a fish. Mermaids sit on rocks and sing to passing ships, distracting the sailors and causing them to run their ships aground. Mermaids live at the bottom of the sea, and are reputed to drown men while carrying them down to their lairs. Mermaids have always been considered unlucky, and are usually a sign of an impending disaster. Dreaming of a mermaid is a sign that you are not fully protected, and someone may try to take advantage of you in some way.