I just introduced two different flocks, some 7-month-old Isa Browns and a group of 3-month-old pullets that included 23 Rhode Island Reds and a Domanecker. The Isas went for the Domanecker immediately and since the Reds are two small to be contained by the electric fence I have around their coop I've been letting the Isas out during the day and keeping the Reds and Domanecker inside, then putting the Isas in at dark. Today I wanted the Isas to stay in for the morning to lay eggs in the new nesting boxes I introduced yesterday. Plus it was raining like hell all morning. When I went out at noon to let the Isas out and collect eggs, they were huddled around the Domanecker, which was dead, its backend feathers all picked clean. The Isas haven't done this to the Reds (yet). Why did they single out the Domanecker (she was almost as big as the Isas are)?