The significance of washing in their behaviour is also discussed. They are light yellow to reddish brown in color with a darker abdomen. The methods by which Monomorium pharaonis workers communicate with one another are discussed in relation to those of other social insects. Pharaoh workers are about 1/16-inch, or 2.0 millimeters, in length. The queen, who rarely foraged, was not fed at once by the returned workers, and often she solicited food without success for 20 minutes. After a variable time the workers returned to the nest cell. This excited behaviour caused all but one or two of the workers in the nest cell to leave the cell and feed at the liver. Foragers, who appeared to find the food by undirected search, returned to the nest and entered in an “excited” way, which is described. When a new source of food (rabbit liver) was added the behaviour of the population altered. The activity of the ants was variable and sometimes none of them moved for a few minutes, this inertia was broken by spontaneous movements of one ant which disturbed its neighbours. Do not use liquid or dust insecticides they could spread ants. Pharaoh ant workers are pale red to yellow-brown their abdomens are usually darker than the rest of the body and can have red or black markings on it. The behaviour associated with food-sharing is described. Baits can take time (months) to eliminate infestation. Foodsharing occurred between the members of the group workers fed the queen and each other, very rarely the queen fed a worker. Experiments were carried out with populations of a queen and about eight workers of Monomorium pharaonis (L.) kept at constant temperature in very artificial conditions.