Scientists discover "cleaner ants" that groom giant ants in Arizona desert | Hacker News

Researchers reported an unusual ant interaction in the Arizona desert: tiny ants grooming much larger ants.

The behavior highlights how cooperation and mutualism can emerge even between very different species or body sizes.

The article uses this example to explore a bigger evolutionary theme: how cooperation, competition, and division of labor shape complex life.

It connects ant symbiosis to broader natural partnerships such as mitochondria, lichens, gut bacteria, and mycorrhizal fungi.