We have been unusually hot here too. I set up a soaker hose (the flat ones with little hole poked in them) running down the middle of their pen and they absolutely loved it! They would spend most of the day foraging or laying under the mist from the hose. Not one single bird under there was panting. Killed two birds with one stone, watered my lawn for them to forage in and kept the little fatties cool. Major advantage to having them on grass!!