After red imported fire ants migrated to other countries, their social organization changed to multiple-queen colonies. In addition, because they had no natural enemies in their adopted habitats, they used large numbers to achieve dominance, occupying territory with a rapidity like that of a marauding army, annihilating native ant colonies one by one.
入侵紅火蟻移民外國後，不但蛻變為多蟻后社會，由於沒有天敵，牠們以量取勝、迅速佔領地盤的本事可謂橫掃千軍，把其它本土蟻群逼得逐一衰亡。