 Workers from different "Nothomyrmecia" colonies are not antagonistic towards one another, so they can forage together on a single tree, and they attack if an outsider tries to enter an underground colony.Ants such as "Camponotus" and "Iridomyrmex" may pose a threat to foragers or to a colony if they try to enter; foraging workers that encounter "Iridomyrmex" ants are vigorously attacked and killed.