When I was a kid, I got into the habit of closing both the seat and the lid after using the toilet. We had cats at the time, and they would try to drink out of the toilet.
Try and drink out of the toilet? We threw in the towel with that one. We have one cat that runs when he hears the toilet flush...fresh water, of the purest source! (We don't use chemical toilet cleaners for this reason.)
Though he's not above drinking dirty...while someone's trying to go... That's why we call him Stupid.
One of the best dreams I ever had was about the cat I had at that time doing a documentary about humans and their curious behavior with toilet water. He said "I just cannot understand why these simple humans just come along and befoul such a pure source of fresh water!" When he put it like that...well, I get it now. Not ready to grab a cup and take the same plunge, but I get it.