I hunt property that has cows and one thing I learned is that you want to avoid them when you're walking into your setup, they will and do start mooing, and warning animals close by that something isn't right. As for Cow pictures... I don't know if the cows will be on the game trails, my experience with them is they usually tend to stay in the pasture, if provided, but I have had a cow come in under my stand in some of the thickest woods i've ever been in. So, in all reality, you never know. Just don't shoot one, you might make the owner a little upset, and draggin that thing out would be one heck of an ordeal.