The little fuzzy balls are chicks that are all hunkered down for the night. They resisted sleep most of the day, but at last they all cuddled up and succumbed to it. They were so funny, just like people, for they would start to droop, and then jerk themselves awake with a start. Then their little heads would droop again, and their beaks would hit the hay. Sometimes one would get the idea that she'd rather be in the middle, and step on all the others and wake them up!
But oh, the poor little things need a mama hen, don't you think? It is good they have each other to cuddle with; and even though they were raised in an incubator, they probably have an instinct (just as they do for food, water and scratching) to go and get under mama hen's wing.