Doug Perrine / Ocellated eagle ray (Aetobatus ocellatus) accompanied by Whitemargin unicornfish (Naso annulatus) at Eagle Ray City, Saipan, Northern Mariana Islands.

Norbert Wu / Whitemargin Unicornfish (Naso annulatus) long horn has unknown function, Fiji

Juergen Freund / Whitemargin unicornfish {Naso annulatus} Great Barrier Reef, Australia