I just got a batch of chicks that are maybe 3 days old. They're in a big brooder, with a heat lamp in one side of the brooder and the other side to serve as a place to go if they get too hot. By the heat lamp, it's reading about 90 degrees, slightly higher at times. I understand that a chick will move to where it feels the temperature is most comfortable, but is this too hot for them? If so, why don't they move to a cooler spot? They're not panting, and actually seem to be enjoying the warm temp in there, which all previous batches of chicks preferred a slightly cooler temp.