Beehives and ant nests, with their separate castes of soldiers, scouts, and nursery attendants, are examples of ultrasociality, and so are human societies. One of the key features that has helped all the nonhuman ultra-socials to cross over appears to be the need to defend a shared nest. The biologists Bert Hölldobler and E. O. Wilson summarize the recent finding that ultrasociality (also called “eusociality”)45 is found among a few species of shrimp, aphids, thrips, and beetles, as well as among wasps, bees, ants, and termites: In all the known [species that] display the earliest stages of
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