Army Ant Bivouac Army ants are nomads; their ferocious appetite means that they must  move to new regions every few days in order not to starve. As a result, they make a temporary nest constructed out of individual ants. Depending on the colony size, 150,000 - 700,000 worker ants link onto each other to form a structure 1m in diameter. The queen and larvae are protected near the center of the protective mass. Geoff Gallice on Flickr