When topping up the bird bath with warm water, I could see where the cats had licked a hole though the ice on the surface to get at the water below. The hole got bigger when warm water was added to it. Potato Beetle was absolutely fascinated by it. He kept prowling around it. Water and bubbles must have been sloshing on one side as he did, because he kept going from the hole, so a spot beside it. Eventually, he started dipping his entire leg through the hole, causing something to to move on the side, which would catch is attention. Back and forth he kept going!
It was quite entertaining. 😀