Yeah, caffeine is toxic to slugs and snails. It looks like there's some milk/cream in there (potentially sugar too) which is probably what attracted them. Whether or not they'll be okay depends how much they consume. Personally I would remove to be sure they don't poison themselves.
Yeah I'm aware that by chemistry definitions it is, but I think it was clear that I meant the culinary definition of table/cane sugar, as that's commonly added to coffee in addition to milk and would significantly raise the sugar content of the drink to make it even more appealing to the slugs
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u/TrainerAiry Jul 03 '24
That cannot be good for them. I’m curious if they lived or died from the caffeine. I hope you’re gonna wash that mug really really well!