The smallest one, an Americauna that is only three days old, fell asleep in my hand!
We made them a cozy home and brought Atomic Cluck in for an introduction. She got extremely still and just stared at them. Then she hopped off my lap and ran out into the yard calling over and over. I have no idea what's going on in her little brain, but it was certainly unusual behavior. Once they are a little bigger and stronger, we'll start some supervised "play" time between them.