I am so surprised at these little guys. They hatched under mom on Dec 5. I have been so worried about them being able to stay warm enough. Here, the weather changes alot. For instance, yesterday was sunny and the high was about 35, today drizzling all day and its in the low 50s. We have had several freezes since they came. They are always outside. Yesterday, they were stretching out in the sun when it was about 34 out and they looked like those happy content very warm little babies I've had in a 80ish degree brooder! I don't know if its because they were incubated and born in the cold or if they may be getting feathers a little faster. Today, they have been out in the wet with mom quite a bit. I check on them often and never even see them shivering. At night, they have access to the brooder, which has a 250 watt red light. It stays about 20 degrees warmer in there than the outside temp. Most nights and mornings, they are just in the coop, waiting to come out. They only way I can force them to stay in is if I close the little door on the brooder or close the coop door. I was herding them into the brooder if it was drizzly or cold and they stay in for a minute but as soon as I'd turn around, out they were coming. Mom has yet to leave them but for a few minutes and they do go into the brooder on their own when they are chilly. Once in a while, I find them laying in there but its usually a few are in the brooder and the others are in the coop. Now, I would never advocate raising ducklings in this way without mom. I just can't believe they are doing so well. All 13 are thriving. They have been on a limited diet for about 1 week. I give them feed (starter now mixed with wheat) 3 times a day and they finish it (with a little left) in about 10 minutes, thats with mom eating too.