My son called me while on my way to work this morning. He had gone out to feed the chickens and found several young Silkies (5 of 7) and our d'uccle hen dead in their cage, and the d'uccle rooster "a bit wobbly". The d'uccle hen was a couple years old, the Silkies were a few months old. We have a cage built in our coop (elevated about 3' off the floor) and all our "little" birds are in there; 7 young Silkies and the pair of d'uccles are/were by themselves, and in the same elevated cage but with a mesh divider are our breeding pair of Silkies. He said the breeding pair are as lively as ever, pecking his hand as usual when he went to feed them. Down on the floor (concrete with straw bedding) is where we raise our broilers. We recently raised about 70 broilers and took most of them to be processed a week and a half ago, but we kept 7 to butcher ourselves at our convenience. Those 7 broilers are all ok. Last night it did get down to 24-25 degrees, but I wouldn't have thought the birds wouldn't survive that since winter here in northern IL gets much colder than that, and we've not had a problem losing chickens from the cold in the past. However, this is the first winter we've had the Silkies and d'uccles so they're a new experience for us. We have a completely separate coop for our two turkeys and 35-40 layers/roosters. All of them seem to be doing fine. Does anyone have any idea what's going on?