These ants are extremely common and have colonised most of the world using uncommon habits. Unlike most other ants, up to half of the colony will be fertile females called Intercastes. An established colony will produce winged males and females once a year in spring but after a new colony is established, the queen will eventually die and breeding is taken over by the intercastes. All the females lay what’s called trophic eggs – infertile eggs used as food so they don’t have to rely solely on foraging for nourishment. It’s for these reasons colonies are not confined and can spread over large areas with little sub-colonies popping up in many different locations. Such as behind bark, in gum nuts, in abandoned galls, under your garden fork, inside your old telly, etc. etc.
See more lovely ants here: aussiebugs.com.au/Hymenoptera/Ants