Black crazy ant

Common around man-made environments such as parks and flowerbeds. Because of where it lives it often has to relocate, and moving behaviour is frequently seen just before and after rain. Research has also found a specific bacterium in large quantities at its nest sites, and the ants move when the proportion of that bacterium drops, suggesting some kind of symbiotic relationship. Workers are monomorphic with no soldiers, and the species is polygynous. It moves extremely fast and scatters erratically when disturbed, which is why it is commonly called a crazy ant.