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

Wasmannia auropunctatawasmanniamyrmicinaeformicidaehymenopterainsectsinsectantslittle fire antlittle fire antselectric antspestsinvasive speciestropical antsant trailspheromones