David Fleetham / Giant / Star pufferfish (Arothron stellatus) opening gills to allow the Commensal / Periclimenes shrimp, (Periclimenes sp) to go inside in search of parasites, Bali, Indonesia.
01215466
GEORGETTE DOUWMA / Two Elongate surgeonfish (Acanthurus mata) with Bluestreak cleaner wrasses, showing the colour changes the fish can go through during cleaning. Sweepers in background. Andaman Sea, Thailand.