In the Arizona desert, scientists have uncovered a bizarre and almost unbelievable partnership between ants: tiny cone ants acting as “cleaners” for much larger harvester ants. Instead of attacking, the smaller ants crawl over the giants, licking and nibbling their bodies—even venturing between their open jaws—while the larger ants calmly allow it. The scene resembles underwater “cleaning stations,” where small fish groom predators like sharks.