Used to be around here they did not used to spread domestic turkey droppings, after they started doing it there started to seem be an up shoot of problems with birds in the area. I do not think wild birds are able to handle what domestic birds can and I think that is part of it. I know some will say when they get around it flying around bird farms (Clearly I am not just talking turkey) but not to the extent they do since it started to become used wildly for fertilizer, now the wild animals including birds are much more exposed to it and I seriously wonder if it has actually be looked at as it seems to be an odd coincidence.