Red imported fire ants originally inhabited South America's Parana River basin. In their native habitat, the ants live as a single-queen colony, with each colony consisting of 50,000 to 240,000 ants.
入侵紅火蟻原來分佈於南美洲的巴拉那河流域，在當地是單蟻后社會，一巢約有 5 到 24 萬隻蟻。