Many mites live in the bivouacs and ant columns. A camp, bivouacs and leadership courses are held annually. All demolitions were complete by 13&colon;00 when the units returned to their bivouacs. The spring rain brought flooding to the Blues bivouacs. Both bivouacs and horse lines of the light horse and mounted rifle brigades were attacked. The Crown Prince of Wurttemberg reported 21 men dead in bivouacs. Bivouacs and dumps were also hit and left burning. Larger workers also serve as porters, carrying larvae to new bivouacs. The village quickly became an important forward site for supply depots and bivouacs. Thermoregulation within these bivouacs is accomplished through the opening or sealing of airways. Two new bivouacs will be formed and break off into different directions. On 25 March, the Anzac Mounted Division moved out of their bivouacs in two columns. Purpose-made stand-alone flies are also sometimes referred to as bivouacs, bivvies, tarpaulins, or hootchies. Bivouacs tend to be found in tree trunks or in burrows dug by the ants.