I need advice, I have three (or had three) sussex (all three were hatched on 12/12/2010). One is a pure coronation (roo) and the other two are light sussex (both pullets). All were fine last night. I watched them foraging in their enclosed run, everything looked fine. I closed up the coop around 8:30pm. Went out this morning unlocked the run, opened the pop hole door and went to give them fresh water, food and some yogurt. When I opened the people door I found two of the birds on the roost (the roo and one of the pullets), the other was on the floor in the shavings dead. I have no idea what happened. There were no feathers missing, no blood, no obvious parasites, eyes were closed but clear (no mucous or discharge). Its like she fell asleep and died! I checked out several droppings but saw no blood or worms. I use only pine shavings and D.E. and the coop was clean (not due for another cleaning until this weekend). I do not use any fertilizers or herbicides on the side of the yard that has the coop and run. They were eating a mix of crumbles and pellets (Dumor). It was chilly last night but not enough for a frost or cold enough to kill her. I am at a total lose. I am worried about the other two though they do seem okay at the moment. I plan on doing a total clean out when I get home from work, my DH dumped the food and water this morning and gave them completely fresh just to be safe. Any ideas on what could have happened? I was planning on purchasing four more pure pullets from a member here on BYC but am contemplating putting that off because of this (besides its a large investment and I dont want to add to the flock without knowing what the cause of this could be). Please Help!!!!!