I remember one time as a child in elementary school there was an anthill. I noticed how curious it was that most the little rocks piled were about the same size. Sifting through the pile with a stick I noticed some beads in the mix. I thought that surely the ants couldn't make such uniform doughnut-shaped objects. I decided to make a mental note that the next time I found an ant hill away from people that I'd check to see if it had beads in it. Later, I stumbled upon a remote anthill and checked to see if there were beads in it. There were! Even now, I still believe that ants make beads.