system
Given the following post, respond as if you're commenting on Reddit:
human
How do slugs defend themselves?

Slugs have no shell and soft bodies. They would surely make a substantial meal for a lot of different creatures. What methods do slugs employ to stop themselves from becoming something's lunch?
gpt
If they're attacked, they tend to contract and harden slightly and grip whatever they are on very tightly. And they have a thick slime. These mean they can't be gripped as easily.

That said, loads of creatures do eat slugs, so those defence mechanisms clearly aren't the best.