Our chickens were hatched last July and were brooded indoors until mid-August, so they've never been through a summer with their adult feathers. Yesterday, we had them all out free ranging from around 11:30AM to 6:00PM and it got up to 80 degrees (F) by mid-afternoon. Now, they never missed a beat or took a break and our yard and their run have plenty of shade, but by evening, everyone but our roo were holding their wings away from their body and panting. Surprisingly, it was our EE (the least fluffy of the bunch) that started acting this way and it was within the first hour of being out in the yard. They have free access to plenty of water and despite obviously being warm, no one was lethargic or acting distressed in any way. My question is, how hot is too hot? When do you know they're actually in distress? I'm guessing they won't stay out in the sun and continue to forage (like they did yesterday) if they're actually that uncomfortable, but I don't really know.