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"An association between members of two different species in which one, the inquiline, lives on or in the other (the host), or inside the host's home, obtaining shelter and in some instances taking some of the host's food." - Dictionary of Biology, Oxford Univ. Press

Bubble Tip Sea Anemone (Entacmaea quadricolor)
Gold-Stripe Maroon Clownfish (Premnas biaculeatus)

An example of why the anemone/clownfish relationship is also considered mutualistic - the butterflyfish is prevented from nipping at the anemone's tentacles by the clownfish.