 "Acromyrmex" ants have two "stomachs", including a dry, social stomach in which they can store food and later regurgitate to larvae, the queen and other ants.This is separated from the stomach proper by a small valve; once food enters the second stomach, it becomes contaminated with gastric juices and cannot be regurgitated.The exact function of the Dufour's gland is unknown, but is thought to be involved in the release of the chemicals used in the production of odour trails, which the ants use to recruit nest mates to a food source.