I added a stuffed bear in the brooder since I was worried they were starting to pile up on each other. They still like to pile up, but now a few climb on top of the bear as well. I am surprised that they are centered under the "lamp" (it is actually a ceramic heat emitter, not a lamp). I know the concept is "if they huddle, it is cold, if they spread out to the edges, it is hot, if they are random, it is all good". The thing is.....I use a laser IR thermometer and the ground reads a little over 100, even a good distance from right below. When they are under there, I am certain it is heating them at least that much since they are closer than the floor. But they don't seem to mind. They still like to huddle. The last batch I hatched on the 4th of July did the same thing. I did not lose any that time, and so far I have not lost any this time. So who knows what is up with their behavior. Wonder if they just want to snuggle each other.