system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why are loud noises so scary to many animals and humans?
gpt
We evolved hearing to both find food and identify threats.


The worst threats are those that don't care if something else hears them - that indicates confidence which is NOT good for the animal hearing it. 


This is why lions roar - to show everyone around them they're the boss. "Come get it."