MUTUALLY BENEFICIAL

This is a Clark’s anemonefish (Amphiprion clarkii), often found between the bulbous tentacles of the bubble-tip anemone (Entacmaea quadricolor). Here they’ve found a home defended by stinging nematocyst cells. The fish brush against the stinging cells to acclimate, developing a mucus-like protective layer that coats their bodies. In return, the anemone is cleaned of parasites by the fish.