Feral cats won't cover their poop
I am feeding several feral cats in my neighborhood. Recently, I noticed that they pooped everywhere and don't cover them anymore. There is a tiny hill nearby, and they visit there all the time, but they are too lazy to poop there.
So far, this isn't much of a problem, but when summer come, neighbors are sure gonna complain(they already tolerated other cat related problems). What should I do?