Anybody want a cow patty?

We live on 10 acres out in the country. This is a picture of our back 5 acres. The front is just about the same. We have no trees (except for the 8 little ones we planted), and we have no cows.

So I'm wondering how this big cow patty ended up on my back yard. Maybe it's the invisible cow that leaves cow patties behind.

Things that make you go hmmmm!