Our chicks are 10 weeks old and just like Gary said are no longer making chick noises. They now sound like chickens! We've had a heat wave here this week, 106-110 this last week. Up from 75 the previous week. Luckily, the chickens having been handling it as well as can be expected. Their run is shaded all day, I've been giving the mash, electrolytes with ice cubes, and hosing down their run multiple times a day. The last two days (the hottest) they have elected to sleep in their run rather than the coop (I've been leaving the coop door open this week). It's supposed to cool down starting this weekend, so keeping our fingers crossed.