Our hens are 6 months old and have been using vertical watering nipples since the brooder. I have seen every hen use the nipples in the run and all seem healthy and are providing eggs. However, when we let the hens out of the run to free range, they immediately find a puddle and drink for 10 minutes straight. All circled around it chugging water. The other day we put out a gallon bucket of water and they drank almost half of it in the morning. Has anyone else experienced something like this? Our routine is usually that we open the run at 8 am and close it after they go in for the night, about 7 pm. Their free range area is 50 x 50. Here is a couple pics of the waterer in the run and the free range.