I just read about a newly discovered species called Temnothorax pilagens.
It apparently is a slave-keeping ant. It raids hollowed-out acorns that are used as shelter by other ants, and takes them prisoner. This species also pillages the pupae to take back to their own nest to be raised as there own.
They call them pillage ants.
Temnothorax pilagens coming to a woodland near you, to enslave other ants in their Acorn Castles!
<add roaring sound here>
No … really. Look here: http://www.livescience.com/42466-castle-raiding-pillage-ant.html
So, my question is: Has anyone else ever heard about slave-keeping ants? Did I just miss this a couple of decades ago? I thought humans were the only slave-keeping species.