David Fleetham / Ringtail surgeonfish (Acanthurus blochii) being examined by Hawaiian cleaner wrasse (Labroides phthirophagus), Hawaii, USA, Pacific Ocean.
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David Fleetham / Orangeband surgeonfish (Acanthurus olivaceus) visiting cleaning station of Hawaiian cleaner wrasse (Labroides phthirophagus).They change colour to expose parasites, some turning black and others turni...