In honor of turkey season and my favorite time of year coming up, I'll share this.. Several years back (maybe even 10 years) I shot a gobbler who had this marble in his crop. Its perfectly round, will roll across a floor with no wobbles or defects, and when you drop it on a hard surface it sounds just like an old school glass marble. It definitely doesn't seem like a natural round rock or stone. I'm stumped other then it may have been a random old marble it had found laying in the creek. I've always considered it good medicine from the turkey woods.