Smithsonian Entomologist Discovers Cooperative Behavior Between Ant Species in Arizona Desert
Mark Moffett, an entomologist at the Smithsonian National Museum of Natural History, has documented a unique interaction between two ant species in the Arizona desert. During a five-day observation period in 2006, Moffett observed large harvester ants (Pogonomyrmex barbatus) allowing smaller cone ants (an undescribed Dorymyrmex species) to crawl over them and clean their bodies, including inside their mandibles. This behavior, reminiscent of fish cleaning symbiosis, was recorded in at least 90 interactions. Moffett's findings, published in the journal Ecology and Evolution, suggest that the cone ants act as 'cleaner ants,' a behavior not previously documented in ants. The study indicates that the cleaning might help remove pathogens from the harvester ants, while the cone ants may benefit from protection and nutritional gains.