Cat ear mites are black solids that grow in the ear canal of cats. Moving mites can be seen under a microscope but cannot be seen with the naked eye. If black solids appear in the cat's ears, and the cat often shakes its head, scratches its ears, etc., it means that the cat has ear mites, and the cat needs to be treated as soon as possible, otherwise the ear mites will become more and more serious and even affect the cat's health. .