Siren

Sirens are deadly creatures, half human and half bird or fish. The top half of the body down to the navel is human (usually female), and early sources say that from the waist down to their feet they are like birds, although later sources claim that they are like fish.  Sirens charm seafarers by singing a beautiful song with the sweetest melody, which sailors hear far off, and are lured from their course and head towards the sirens. The sweetness of the song lulls the sailors to sleep, whereupon the sirens attack them and devour their flesh.

The moral of the story of the sirens is that people who delight in worldly pleasures will fall prey to the devil.