About 10 days ok, one of our young roosters started limping a bit. He's eating and drinking and it was very minor when it started. Now it seems to be progressing and it's wing seems to be hangnig. He tried to flap at me and couldn't get that wing up and then just fell over. His eyes are clear and he's still eating & drinking - just not getting around well at all. The flock (2 roosters & 3 hens) are transitioning from chick food to adult food - on second mix so we're up to 50% chick and 50% adult food. It's very hot (100 to 105) during the day but water is available in multiple places for them as they free run during the day. Any idea of what this is?