A feisty little Argentine ant (Linepithema humile) attacks a much larger fire ant (Solenopsis invicta). Both species co-exist naturally in subtropical South America, but in the southern United States where both have been accidentally introduced, the fire ant has displaced the Argentine ants. Austin, Texas, USA

Solenopsis invictasolenopsis wagneriSolenopsisfire antfire antsred antspestspestpest antinvasive speciestramp antnonnative antsintroducedmyrmicinaeformicidaeHymenopterabiological invasionsinsectssocial insectscompetitionfightants fightingankle biterlegaggressionargentine antargentine antslinepithema humilelinepithemadolichoderinaeecologycompete