If I were to have a snail in my ear that would (obviously, bc it's eating my brain) be carnivorous and hunting me, if I wanted to keep it as a pet I would have to keep it under several lays of security. so on the inside inside, is a little terárium where the snail lives and I feed it chunks of meat. then, around the top of that jar, is vasalene so it can't climb up over the lip. it is also closed by a porous cog or whatever that wind stopper thingy is called so that air can get in and out but not the snail. and then, Incase it somehow does get out, on the outside of that bottle (inside the first bottle) is a sea of salt 1/4th of an inch deep. that bottle also has vasalene on it, and a screw on lid with *tiny* airholes. also this would be hanging from the ceiling, and the inside would be glass and the outside would be plastic- so if it fell the inside bottle would break and I'd hear it but it'd still be contained and possibly dead (from the salt)