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. 2016 Jul 8;11(7):e0158920. doi: 10.1371/journal.pone.0158920

Fig 2. Side view of an excavated layer cake, showing the layers of colored sand, and their depth below the ground surface.

Fig 2

The curtain of sheer fabric that surrounded the column of colored sand has been cut away, but is visible at the edges. The ants were confined to excavating their nest within this column.