Something is emptying the beakers of beer I am attempting to trap slugs with in the veg garden. I fill them up at night, well dug into the soil, next day I find them empty and most removed and left flung round the garden! Today one was just almost empty but still in situ, the others tossed away. I have rabbit wire all round the veg patch. Has anyone any idea who the culprit bent on getting drunk every night might be?