The term 'listening organs' refers to the ears, which are the organs responsible for hearing. The ears are composed of three parts: the outer ear, the middle ear, and the inner ear. The outer ear is responsible for collecting sound waves and directing them into the ear canal. The middle ear contains three small bones that vibrate in response to the sound waves, and the inner ear contains the cochlea, which converts the vibrations into electrical signals that are sent to the brain.