I've had cats that do that before too.
I don't think it's a problem at all, because it's highly unlikely they'll drown. If you're worried about that you can put the lid down when you're not at home.
As for why, I think they prefer the colder water in the bowl. Also - it may be fresher too, as toilets are flushed multiple times in one day.
If you think that's weird, my cat who drank out of the toilet eventually LEARNED HIMSELF to pee in the toilet. I think he just followed our actions (cause we would put water in the tub for him when we used the toilet. Then when we went to the bathroom he would come running to get some tub water. And then of course we used the bathroom while he drank).
I don't think it's a problem at all, because it's highly unlikely they'll drown. If you're worried about that you can put the lid down when you're not at home.
As for why, I think they prefer the colder water in the bowl. Also - it may be fresher too, as toilets are flushed multiple times in one day.
If you think that's weird, my cat who drank out of the toilet eventually LEARNED HIMSELF to pee in the toilet. I think he just followed our actions (cause we would put water in the tub for him when we used the toilet. Then when we went to the bathroom he would come running to get some tub water. And then of course we used the bathroom while he drank).