We had four 2 year old Australorp hens (we now have three...) and one new almost-year-old mixed breed, who may be a rooster (this is the source of some debate). This afternoon I went into the coop and one of the Australorps was in the nesting box, not moving. Turns out, she is dead. This is pretty upsetting, especially because I can't figure out what happened and if I should be worried about the others or their eggs... She and the others have been behaving fairly normally, eating and drinking and they aren't lethargic. From looking at her body, it wasn't clear how she had died - there were no clear wounds, like from a predator or anything. It seems weird to me that she died in the nesting box. What could have happened? Are my other girls in danger?