the dairy industry in NY has been failing for years. i hunted many "$#it farms" because the rules about shooting holes in buildings (they mostly lacked walls and roofs) didnt apply. And i saw some pretty disgusting conditions. But i killed a huge number of pigeons and starlings!That sound like a Petri dish to me Snert. The place I hunt is a feed mfg and I just shoot them off the auger between main building and silo/ grain bin. I use caution handling them.
I just made up a frame with bird wire netting and a door on a hinge. Put some feed out, wait until it's full of sky rats and pull door shut with a rope. Remove, euthanize birds and reset. 7 yesterday.Would like to know more about trapping.