A harvester ant (Pogonomyrmex desertorum) wanders too close to a nest of little Forelius ants, who harrass the intruder until she leaves. Tucson, Arizona, USA
Pogonomyrmex maricopa and Novomessor albisetosa workers, fighting. Resources are scarce in the desert and competition among ants is fierce, leading to frequent conflicts. Green Valley, Arizona, USA
