Quote:
Originally Posted by Stephen Maturin
If the ear was a sense organ, then sound from the external world is traveling toward the ear, striking it, and sending signals to the brain. In that event, humans should be able to echolocate, just as other mammals can. Humans can't echolocate, so it necessarily follows that the ear is not a sense organ.
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Why should they? They don't need to develop this ability unless they are blind. In the case of humans, eyesight is dominant. In the animal kingdom, echolocation is extremely important for survival.