How there is such a bump and how she obtained such a high wall of turf? Looking at the ant, you can guess as there is such a strange architecture. First learned from the soil moves ants spread out around a small flat cone of sticks. On this ground, soft and friable, fast growing fescue. Insects are not touching it, but podsypaya ground, its growth is directed so that the vertical walls are obtained from the turf. Growing anthill grows earthen rampart, growing and fescue, free of vegetation occupying a piece of land. And these are obtained from the anthill sturdy wall that neither wind nor frost are not afraid of him. Very strong - perhaps an ax to cut. So, depending on the situation, change the construction skills of the same ant.