Tucandeira ant nest

Looking at all this freshly excavated wet clay reminds me that I took this picture nearly a month ago, when abundant rains were still falling. The tucandeira ant (Paraponera clavata) may be the largest of all the Amazonian ants. I've never seen a nest this of this size. Normally they enter their underground nest via an opening around a small tree. Guides like to beat up the tree trunk, as seen in the attached image, to call up the angry ants. Next image, the ant.