@IngridHbn Thank you for sharing this! I have pet giant African landsnails and the way I explain it is the shell is hard, like your fingernails, but it would hurt if someone picked you up by your fingernails too because they're connected to delicate tissue. I'd also add that sometimes touching the shell isn't enough - some of my snails are more cautious than others and retract immediately, whereas with some of the more bold ones you have to (gently!) tap repeatedly. Also they're less likely to go back in if they're eating something they like. It really does show that even creatures as simple as snails have distinct personalities and preferences

@IngridHbn
As a biologist, I call bullshit. The anatomy is correct, but I've never seen a snail getting injured by lifting it off the ground. It's not like a suction pad. The only place where it *might* happen is a very smooth, artificial surface, like a window. But there, you'll feel the resistance, and won't rip it off. Also, usually they retreat quite fast when in danger, you don't need half a minute for that.