The sound of a Wakwak is usually associated with the presence of an Unglu (vampire) or Ungo (ghost or monster). It is also believed that this monster is called "Wakwak" due to this sound it makes when it flaps its wings while flying. When one hears the Wakwak, it is looking for possible victims. If the sound of the Wakwak is loud, it means it is far from you. Otherwise, it is near and worse yet, it is about to attack. It slashes and mutilates its victims and feeds on their hearts.