system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how did sheep get rid of their excess wool before humans began shearing them?
gpt
They didn't have excess wool before humans domesticated them.  The excess wool growth in sheep bred for their wool is the result of selective breeding for wool production.  

The wild ancestors of domestic sheep, mouflon, don't have much wool.  Today there are domestic sheep breeds that don't have any wool.