Answer: That is really interesting, I don't think I have heard of this phenomenon before. I suppose the kitty litter would dehydrate the slugs. The only attractant I know of for slugs is stale beer. But, I have seen slugs emerge in the early evening to take advantage of the dew that collects on smooth sides of plastic flower pots and similar containers, so perhaps they found the sides of the litter pan similarly attractive?
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