Written by Joe Ballenger
@BugQuestions What’s the deal with L. humile on the West Coast (one + colony) vs. East (many warring colonies) – Why?
— Nathanael Johnson (@SavorTooth) February 12, 2015

Argentine ants tending their nest.
Picture courtesy of Robert Lord Zimlich, via BugGuide.net.
License info: CC-BY-ND-NC1.0
This is one of those questions that’s really several questions rolled into one, and I think that makes it a great question.
So, ants form colonies. There’s a queen which lays eggs, workers who do the housework and hunt. There’s also the boy ants (drones) which pretty much bro out in the colony’s basement, and occasionally go looking for nice lady ants. That’s pretty much a standard ant colony.
Ant behavior can be pretty complicated, because there’s a lot of variations on this theme. Some ants maintain a bunch of smaller colonies with larvae and pupae, but no queen. These are called ‘satellite colonies’, and are replenished with larvae and pupae from the main (or ‘parent’) colony. Carpenter ants are an example of this.
Other ants, like the Argentine ants we’ll be discussing in this post, may have colonies which have many queens. Multi-queen colonies, or polygynous colonies (as ant scientists would call them), function as single colonies despite the fact there are many different queens producing larvae. These may be sisters, or daughters, depending on who started the nest and who’s giving birth. But they’re always closely related.
…and this brings us to Argentine ants, which are really weird amongst ants. There aren’t that many Argentine ant colonies in the world, and most of the individuals people encounter only come from three or four colonies. These colonies, however, are massive and can stretch across continents. Frequently, all ants found in a country or state will belong to the same colony.
Which brings us to Nathaniel’s question. Some Argentine ants found in the same area fight. Why?











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