The girls were as snug as a bug in a rug when I took their breakfast this morning. Their water buckets had a thin layer of ice which I broke by punching it gently. Dutifully I replenished the water by which time the girls were ready for a drink. Before putting the snout in the bigger girl tapped the top of the water with a trotter. I dont know if this was instinct on a cold day or if she had seen me break the ice and had decided to copy. We do have the most intelligent pigs !