Snail making sounds

[ldablo]

I picked up my snail earlier and there was a sort of "Shlup" noice and a little bit of watery fluid dropped from her.
Is this normal?
Is she ill?

Renamed - CroSSLeSS

[Dusk]

The shlup-noise sometimes happens when they retract quickly - their breathing hole acts much like vocal cords under the right conditions The watery fluid sounds less usual - was she sitting in a puddle, or recently been in a water bowl? In which case it would just be displacement of a little water that was in the shell from that. Is she in good health otherwise?