Very important if you see a bird showing signs of heat stress/stroke to immediately submerge them into a pail of cool(NOT cold)up to their neck,this will immediately drop their body temp and has the potential to save lives. A chickens normal body temp is around 107 degrees,when it reaches around 113 degrees,they are in danger of succumbing to heat stroke. Chickens have no sweat glands,they rely on their respiratory system to cool them down this is why you see panting/wings spread,etc. With heat stroke you will see hard panting,wings spread,birds will become lethargic and unresponsive,cool them down asap if you see symptoms.