A Simopelta queen with attendant workers running in a column. Her abdomen apparently exudes an attractant that keeps the attention of the following ant whose mouthparts are held open above abdominal segment 4. Parque Nacional Henri Pittier, Venezuela

Two nestmates of the odorous house ant (Tapinoma sessile) share a granule of sugar. Champaign, Illinois, USA.

Friend or foe? Two Wasmannia auropunctata meet on a foraging trail and briefly assess each other. Ants from different colonies will attack each other, but these two are nestmates and let each other pass. Gamboa, Panama