Some coral reef ecosystems famously have “cleaning stations,” where fish line up to be cleaned by other species of fish and shrimp. Entomologist Mark Moffet recently published observations of what appears to be a similar relationship in ants. In the Chiricahua Mountains of the U.S. state of Arizona, Moffet, from the National Museum of Natural History, was watching harvester ants (Pogonomyrmex barbatus) collecting seeds when he noticed something odd. He saw several harvester ant workers frozen in place. When he zoomed in with his camera, Moffet saw the harvester ants covered with cone ants (Dorymyrmex spp.). At first Moffet assumed he was seeing aggression between the species. On closer inspection however, he observed that the small cone ants were licking and nibbling the larger harvester ant workers, not fighting with them. Moffet observed the cone ants inspecting the harvester ants’ open mandibles, which could easily crush the smaller cone ants. Moffet observed at least 90 individual harvester ant workers being tended this way and concluded that they might be getting cleaned by the cone ants. He even watched harvester ants approach the nests of cone ants and wait for cone ants to attend to them, which reminded him of reef fish lining up for a cleaning by cleaner fish species. The big question is: What is each species getting out of the arrangement? Moffet consulted colleagues and came up with several possible explanations. Perhaps the ants exchange microbes, which create a healthier microbiome for both species. Or maybe they swap pheromones,…This article was originally published on Mongabay

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