I forget which book I got that line from, but it was almost certainly a book about sustainable agriculture. Every change that we make will have consequences, some anticipated, some completely unforeseen, some pleasant and some unpleasant. I added cats to the farm to keep the rodent population in check, and they do a wonderful job at it. However, they've also become convinced that the haystack is the ideal litter box. This is disgusting and unsanitary, but then again so are mouse droppings in the hay. I think that next year I will need to come up with some sort of basic tying or bailing system to encourage them to find a litter box that is more pleasant for us humans. Perhaps I will also put in a small pit filled with loose, dry organic matter, with a roof to keep the rain off. It could be a self-composting litter box. I will have to ponder this some more.