A couple weeks ago, I built a poultry nipple watering system, but the birds don't seem to understand how to use it. We took out their regular waterer for a few hours, but they still didn't even attempt to use the nipples, in spite of several attempts to show them how they work. When we put the regular waterer in, they went nuts like they hadn't had a drop in days. The system is a 5 gallon bucket with 2 inch pvc plumbing to a 6 foot long pipe with 4 nipples spaced 1 foot apart, about 18 inches high (we only have 5 birds). The nipples even have glistening drops of water on them from the poor internal seals...Anyone have any help before we start grabbing them and shoving their little beaks onto the nipples.