You won't find winged forms because mating usually is found in the nest.
Argentine ants are aggressive, often eliminating other types of ants in the same area.
They also destroy and eat other household pests such as cockroaches and exposed termites. However, they prefer sweets and are often found tending aphids or scale insects on plants, using them as source of honey dew. They usual habitation is outside, but can present a problem when they come inside foraging for food. They rarely nest in walls of buildings, as the pharoah ant. They more often than not, enter to forage and then exit.