Hearing Ability

In the animal kingdom, ear size doesn't necessarily determine hearing ability. Compare bats and chinchillas. They both have large, prominent ears but vastly different frequency ranges. Bats can hear from 2,000 to 110,000 hertz (Hz), while chinchillas can detect only 90 to 22,800 Hz. And in most large-eared animals, ear size has more to do with keeping the animal cool than it does with helping it detect sound. Consider how much larger the ears of African elephants are than those of Asian elephants. Those giant ears help redirect heat from the body, a useful attribute in a hot climate. Let's get back to people. The external portion of our ears (also known as the pinna) has two main purposes: to protect the ear canal and to channel sound into it. Neither of these functions are improved in larger ears. The shape of our ears is much more important here. But keep in mind that the broad variety of human earlobe shapes doesn't impact hearing differences. Unless there's a congenital defect, the basic structure of the ear is relatively the same in all people.