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In humans, physical stimulation, such as massage therapy, reduces stress and has demonstrable health benefi ts. Grooming in primates may have similar effects but it remains unclear whether the positive effects are due to physical contact or to its social value. Here we show that physical stimulation reduces stress in a coral reef fi sh, the surgeonfi sh Ctenochaetus striatus . These fi sh regularly visit cleaner wrasses Labroides dimidiatus to have ectoparasites removed. The cleanerfi sh infldoi:10.1038/ncomms1547 pmid:22086335 fatcat:nkxlaipkvfhihkydmnvgimsihy