The Slave-Maker ant is a species of ants that enslaves other ants!

The whole process is really complex. The slave-maker queen fakes her own death and gets carried to the host colony. She then wakes up, and then kills and impersonates the queen. The fake queen will then start making her own offspring, who eventually take over the nest and enslave the previous inhabitants. The slave ants will unknowingly feed the fake queen and its offspring, not realizing that they are impostors.