Who needs hearing?
The outer ear collects sound and sends it into the ear canal. Sound waves make the eardrum vibrate, the vibration passes to the fluid-filled cochlea, and a signal goes along the hearing nerve to the brain. Most of the ear is inside the skull. Animals hear in different ways: an elephant hears with its big ears and cools off with them; a rabbit’s long ears serve for hearing and for cooling its body; an owl hears extremely well even without outer ears; a snake has no outer ear but has inner ears and senses ground vibrations; a cricket has ears on its front legs. Protecting hearing: avoid loud noise and music, wear earphones at low volume and not for long, never poke the ear with sharp things, dry the ears after swimming, and see a doctor if they hurt.
Ear model: draw an ear and label its parts. In pairs one child whispers a sentence and the other listens normally and then with a cupped hand. When was it clearer?