Oh wow, that is interesting! Yes, whitish stringy stuff is what I found. So that is fine? Would be great if I could use it after all - the pile is still sitting there…Without seeing a photo of what you're calling mold I can't 100% be sure of my answer, but what I suspect you're seeing is the fungal life in the chips as they begin decomposing in the pile, and that is a very good thing. It will be reduced when spread thin and mushed around by the chickens, but that is a great sign you have the microbiology in there to make the system work. Are you seeing lots of white/cream colored fungal growth? That is the good stuff. Woodchip based compost/mulch should be fungally dominant, not bacterically dominated. Adding the chicken poop will push it towards being bacterically dominated so starting with lots of fungal activity is excellent.