oh, OK that makes sense. Actually, I was thinking one week old ducklings with newly hatched ducklings might be just fine. I actually have done that in the past, but I watched carefully there was another time that I had two ands half week old ducklings with newly hatched, and that was when I had to put a dividing screen into the brooder, give them each their own waters and foods on their sides, I hung a heat lamp above and pointed towards the center of the brooder so they could all cuddle up near each other on opposite side of the screenIt did say chicks, it was updated and changed later.