We’ve had llamas for years. Something interesting about their behavior is that they use communal dung piles. One of them picks a place to do their business and all of them will use that spot over and over. If they stay in one area for a while, they will create an area that will stay significantly greener and more productive for years. I can see how someone might have capitalized on this.
Maybe you can fake them out by moving some of the pile.