Grass-cutting ants occur in the Chaco region of north Argentina and Paraguay and belong to a subgroup of leaf-cutting ants that specialise in harvesting grass leaves.

BBC: Earth News - Ant's head balancing act revealed by video

It's a bitter blow for the museum, and for the plants and animals of the Gran Chaco, which is threatened by illegal logging and forest clearance for agriculture.

BBC: Paraguayan expedition abandoned

Paulson Chaco is Director of the Navajo Division of Transportation occupying a cabinet level position to the President of the Navajo Nation.

WHITEHOUSE: Champions of Change Blog