Slave-Makers and Slaves
Slave-making ants are social parasites of certain other ant species, which are called "host" or "slave" species. A slave-maker colonies gets started when a newly mated slave-maker queen enters a host-species nest and either kills or drives away the adult inhabitants. These invasions occur at a time of year when worker pupae are present in the host-species nests; and the young host workers that mature from the captured pupae form a social attachment to the parasite queen, becoming her first so-called "slaves." These host workers then rear a batch of slave-maker workers that subsequently raid other host-species nests to capture additional host-species worker pupae that are reared to produce additional slaves.
Workerless Parasites (Inquilines)
Inquiline parasites are ant species that have lost the worker caste during the process of their evolution to become parasites. Newly mated parasite queens invade host-species colonies and secure adoption, but some or all the host queens survive. Subsequently, the parasitised colony continues to produce additional host workers (the offspring of the surviving host queens), but the colony subsequently rears only (or mostly) parasite queens and males.