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Flowing and rebuilding of ant towers. (a) Schematic of the tunnels observed underneath the ant tower. (b,c) Side views by video camera and X-ray showing ants sinking within the tower. The solid circles represent the characteristic trajectories of ants tracked over a period of 15 min. (d) View of the tower from below. The colours indicate the motion of the ants, black referring to no motion and red indicating the flow of traffic. The tunnels migrate, merge and disappear with time.
