system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do tails on animals help their balance?
gpt
Stand on one foot and keep your arms at your sides. How hard is it to balance?

Now stick your arms out. How easy is it to balance now?

If you had a tail to stick out too, can you see why this might help you balance?

It allows finer control over your center of balance.