I've had a time with possums. Over a period of months they wiped out my flock. Only the lone goose is left. She's pretty big. I got a new flock I raised from babies. They're 8-9 weeks, getting almost pullet size. Because of size limitations I decided to move a few to the big pen, where the goose lives to see how they would do. I moved 5. The next morning, one was alive. One was dead, but not eaten at all. The other 3 were just gone. No feather piles. I found a possible place they might have gained entry and sealed it up. Now I am scared to put any more down there, although, unless I build something else, I will eventually have too. Now they are in a box open on the grass on the bottom, Chicken wire on top. and kept real close to my house. Predators rarely come up here.. But they are getting too big for it.