I got some Cornish Cross chicks on Thursday. They are three days old today. All are eating and drinking as only Cornish Cross can. There's about 150 of them, I'm using a horse stall (10 by 12 or so) as a brooder. 50 are mine, the others are being picked up by different families on Sunday. Last night I put enough heat lamps in to make the stall nice and toasty, and spread them around so there was plenty of room for them all to sleep, and also to get away from the lights if they wanted. This morning I found the whole bunch of them piled 4 or 5 deep under one heat lamp, even though it was warm all over, (this was late morning, nearly 11, so the sun was out and it was in the upper 70s not counting the lamps, under them it was high 90s.) even though there was plenty of room to spread out to the others. Eleven chicks were dead at the bottom of the pile, squashed into chicky pancakes. I tried putting them into boxes, about 25 per box, with lights over them, but they would either just jump out of the boxes or still pile up. Tonight, I added a four foot long aquarium light fixture with old towels sort of tented over it to make them a cozy tent to snuggle into, the light is 160 watts and puts off a good deal of heat, enough to burn me if I touch the bulbs after they're on a few hours. They're a little more spread out, but they are still 2-3 chicks deep and I don't want any more to get squished to death! Why would they be piling up so much even if it is warm enough? Any ideas how to keep them from doing this? They are even doing it some during the day, and it's 100 degrees in there in the afternoon, some are running around eating and some are piling, I go out every couple of hours and break them up to rescue the ones on the bottom, who come out looking a little dazed. I don't want to end up with no chicks for myself or having to refund customers and lose a lot of money on dead chicks.