Well before I went and got my ducklings, one of the things I noticed at the store I got them from was that they will all cluster together for warmth. The chicks were doing it, so were the ducklings, and others. It seems that's part of the instinct, and its neat to see it.Hey!!! Thank you guys!!! I had managed to make a wooden brooder using a 25w bulb, the temp was kept at only 30C (86F) for the first 1.5weeks. Now I put them in a bigger box in the garage, no heating source, just normal light and they are doing fine and happy, just...flying everywhere... I'm surprised that they are such hardyyyyy birdsssss!!!