Why do we have two ears?
For grown-ups: the science
Two ears help your brain figure out where sounds are coming from.
With two ears spaced apart, a sound usually reaches one ear slightly earlier and may be louder there. The brain compares these timing and loudness differences to estimate a sound's direction; two ears also support hearing in noisy places.
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Transcript
A bird chirps on one side of you. Why do we have two ears?
Sound reaches one ear a tiny bit before the other ear. Your brain notices that little difference.
Sounds can also be louder in one ear than the other. Your brain uses both clues to find the sound.
Two ears help you tell where a voice, bell, or bird is. They also help you hear sounds around you.
So that's why we have two ears: they work as a team to help us find sounds.