Alkonost

The Alkonost is, according to Russian mythos and folklore, a creature with the body of a bird but the head of a beautiful woman. It makes sounds that are amazingly beautiful, and those who hear these sounds forget everything. She lives in the underworld with her counterpart the Sirin. The alkonost lays her eggs on a beach and then rolls them into the sea. When the Alkonost's eggs hatch, a thunderstorm sets in and the sea becomes so rough that it becomes unnavigable.