Argentine ants, also known as black ants, are the most commonly found species in the southwest. These ants do not attack or compete with each other, which has helped them spread prolifically. Although not poisonous to humans, Argentine ants can quickly infiltrate homes, rapidly taking over bathrooms, kitchens, and pantries in a matter of hours. Their ability to form large colonies without internal conflict makes them particularly challenging to control, often requiring professional intervention to effectively manage infestations and prevent their return.