Bivouac (ants)

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A bivouac is a structure formed by migratory army ant and driver ant colonies, where a nest is constructed out of the living ant worker's own bodies to protect the queen and larvae, and is later deconstructed as the ants move on.

They can devastate an area of more than 1,800 square yards in a single day, so they must constantly move to new areas. During what is called the migratory phase, the ants set up a temporary camp called a bivouac in a new site nearly every night. As many as 150,000 to 700,000 worker bodies cover and protect the queen, linking legs and bodies in a mass that measures a meter across. Thousands of larvae are located near the center with the queen, and workers are responsible for feeding them. Larger workers also serve as porters, carrying larvae to new bivouacs. In the morning, the bivouac dissolves into raiding columns that form a fan-shaped front. These raiding columns can travel up to 20 meters per hour with lead workers laying a chemical trail for other workers to follow. Smaller workers lead the column, while larger, formidable soldiers protect the flanks. http://www.calacademy.org/naturalhistory/ants.html#army