It was actually because one of them had roll in the runny poo from last night, and some of the others were just plain stinky. And I agree, it doesn't HAVE to be precise--as long as it's not hot, or really cold.

But usually 2/3 of my animals will thrash like mad and try to get OUT OF THE WATER... which is a pain if I'm actually trying to soak them.

This is the first time they've all sat there placidly. Maybe it's just that the house is so cold, and the water's just a little warmer than the air?