I don't see anything definitive. They look like chickens in the heat. Since they're congregating in front of the fan, and not moving around much, that would be my guess. I honestly would work on some cooling options, try to provide more shade if you can, change water often so it stays cool...
How old are the birds? I would give electrolites for 1/2 a day, and then switch to plain, fresh water for the rest of the day. If you can, freeze some water bottles that will fit in your waterers, those will help keep the water cool. I do that when its really hot, and change them out as...