A breed known as the driver ant has the largest colonies of any social insects.
Ant colonies usually fight each other, but some species don’t. The result is supercoloniality, where ants mix freely between nests. Such supercolonies can be really huge – Argentine ants had one with millions of nests spanning the Southern Europe’s coast for over 6,000 km. There are similar ones on a smaller scale in Japan and California. In fact, all of these together were termed a megacolony, as the ants from all of them were proven not to show aggression to each other.
Here’s what an Argentine ant looks like:
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