Mark Moffett / Amazon Ant (Polyergus sp) group returning to their home nest at the conclusion of a slave raid, grey slave ant carries one of their pupa, near Lake Tahoe, California

Andy Sands / Slave-maker ant (Formica sanguinea) carrying larvae back from a raided nest, Surrey, England, UK. August.

Andy Sands / Slave-maker ant (Formica sanguinea) carrying pupae back from a raided nest, Surrey, England, UK. August.

Mark Moffett / Ant (Temnothorax sp) worker from an unenslaved colony biting a much larger Slave-maker Ant (Protomognathus americanus) worker, if the slavemaker ant survives this attack and is able to get back to its...

Mark Moffett / Ant (Temnothorax sp) worker from an unenslaved colony biting a much larger Slave-maker Ant (Protomognathus americanus) worker, if the slavemaker ant survives this attack and is able to get back to its...

Mark Moffett / Ant (Temnothorax sp) feeding a worker of the Slave-maker Ant (Protomognathus americanus), Ohio

Mark Moffett / Ant (Temnothorax sp) tending the pupa from a colony of Slave-maker Ants (Protomognathus americanus) inside a hollowed-out acorn, Ohio

Mark Moffett / Slave-maker Ant (Protomognathus americanus) colony living in a hollowed-out acorn with orange-colored slave Ants (Temnothorax sp) tending the brood, Ohio

Mark Moffett / Slave-making Ant (Protomognathus americanus) and their orange Ant (Temnothorax sp) slaves in acorn, Ohio

Kim Taylor / Slave-making ant {Formica sanguinea} carrying 'slave' Negro ant {F fusca}, UK.

Kim Taylor / Slave-making ant {Formica sanguinea} carrying Negro ant {Formica fusca} slave.

Mark Moffett / Ant (Harpagoxenus sp) queen being groomed by Slave Ant Worker (Leptothorax sp) while others in the background groom and carry larvae, Massachusetts