I unfortunately found out they like spoiling chicken.
Had a case of raw chicken wings left over from a family cookout that we didn't use. They set in the downstairs fridge and had just barely started to smell a little when I noticed them. Took them back in the ravine. The opossum tore them up the first couple of nights. I went back at daybreak on about the third day and shot a yote on the pile.
Another thing I've learned is that in the winter time when food is tuff for them, it does not take a big pile to attract them. Something small with scent will bring them in. Have used leftovers, beef and pork bones etc. with a bit of success. I think sometimes we get thinkin it has to be something wild we use in our bait piles to draw them. Just haven't found that to be the case.