I was just completing a walk when I noticed what I at first took for two balls, one on each side of the trail. One was clearly a soccer ball and the other looked to me like a somewhat deflated beach ball. As I got closer, however, I noticed the one of them was not a ball but a large puffball fungus. I moved the soccer ball closer to the fungus so I could take this picture to show their relative sizes. It was a pretty big fungus!