[Chicken Schiff is absolutely the worst smelling farm animal crap there is]
As someone who’s had to put up with neighbors who raised their own chickens *and* driven past hog farms in the Midwest, I can tell you that hog manure is so strong-smelling, you want to breathe through your mouth throughout the range of that odor. But nothing compares to human manure, which is harvested from sewage systems, composted and recycled as fertilizer. Put some of that in the park, and the reek will attract flies while repelling people.
https://www.nbcchicago.com/news/local/chicago-parks-use-fertilizer-made-from-human-poop-to-keep-grass-healthy/51649/