ɹˈeɪnboʊ ɹˈʌnɚz ᵻlɐɡˈɑːɾiz baɪpˌɪnuːlˈɑːɾə hɐvbɪn əbzˈɜːvd ɹˈʌbɪŋ ɐɡˈɛnst sˈɪlvɚtˌɪp ʃˈɑːɹks, jˈuːzɪŋ ðə ʃˈɑːɹks ɹˈʌf skˈɪn tə skɹˈeɪp ˈɔf pˈæɹəsˌaɪts.
Rainbow runners (Elagatis bipinnulata) have been observed rubbing against silvertip sharks, using the sharks' rough skin to scrape off parasites.