Little ants groom big ones in a desert spa

Even ants deserve their spa day. Pogonomyrmex barbatus harvester ants pay regular visits to the nests of much smaller ants, which seem to groom the hulking visitors — the first known example of such mutualism between ant species1. Access options Access Nature and 54 other Nature Portfolio journals Get Nature+, our best-value online-access subscription $32.99…

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