Just think we could get some funny stories here. My egg layers were bad girls yesterday. I have a 50 gallon watering system that goes to three coops. The one in the layer run had a nipple that was pouring out water. The pvc pipe had chipped when putting it together but was holding water fine. After the layers hit it enough it leaked. I put some silicone around the nipple and let it dry overnight. The next morning they came out and started to eat the silicone and before I could stop them one had taken it off and was running around with a chunk of silicone in its beak like it was the best food ever. I grabbed the silicone and had to patch the pipe with a pvc union. WHY EAT SILICONE. Nobody got sick so its all good.