The advantage of this adaptation is food for the remora and some cleanliness for the other organism. Giant eels also have a symbiotic relationship with little butterflyfish. The eels allow for the butterflyfish to swim in and out of their mouth, where they pick small parasites out of the eel's mouth. This relationship provides food for the butterflyfish and health for the eels. Symbiotic relationships are also characteristic of sea anemones.
Sea anemones allow for both clownfish and juvenile damselfish to live within their tentacles.
Clownfish have adapted to the hostile, stinging environment of anemones by coating themselves with a protective mucus. By living within these tentacles, the clownfish are protected from their natural predators. In return for this protection, clownfish likewise fend off any other animals looking to eat the anemone. Similarly, the juvenile damselfish lives within the anemone for protection, and its bright colors attract prey for the anemone to feed on. In both relationships, the damselfish and clownfish share in on the anemone's kills.