Ants Stealing Pupae, aka "Pirate Ants" - Family Formicidae

I came across these ants as they were frantically moving pupae (brown fuzzy "pills" in the photo). I think they were probably some kind of slave-making ants, which are brood parasites, that were in the middle of a raid in which they were stealing pupae from another ant colony. They weren't taking any larvae or eggs, only the pupae, which is often typical in a raid. There were also dead adults in the log, which I'm guessing died in battle while trying to defend their brood. The raid is probably terrifying to victimized ants, and in a sense is akin to the horrifying methods that humans use to obtain slaves. During a raid, the slave-maker ants steal pupae from nearby ant colonies. After emerging in the slave-maker nest, the enslaved ants work as if they were in their own colony, therefore increasing the workforce for the slave-maker ant's colony.

Not only do the ants steal pupae and enslave them, they also employ chemical warfare during the raid. Ants have Dufour's glands, which secrete chemicals that the ants use to communicate. However, during a raid, they use this gland to manipulate the host defenders into attacking each other instead of fighting against the slave-maker ants.