system
Given the following post, respond as if you're commenting on Reddit:
human
Why do we humans call our hairs...hair? But call animals's hair fur? What's the difference?
gpt
There is no definitive difference, it's mostly semantics.  Basically, usually humans are described as having hair, animals have fur.

A less human centric difference between them is that fur usually grows of a year or less before stopping and falling out.  Like most dogs, cats, and other animals who shed every year.  

Hair grows for many years before stopping, so isn't shed every year.  Human head hair usually grows for 5-7 years.  This is like Human head and beard hair, sheep wool, poodle hair etc.

This isn't perfect because human body hair grows for up to around 3 months.  That means humans have hair on our head, but fur on our bodies.