The following are examples of
(i) An orchid growing as an epiphyte on a mango branch
(ii) Barnacles growing on the back of a whale
(iii) Clownfish living among the stinging tentacles of a sea anemone
(iv) Egrets foraging on the grazing cattle
commensalism
All are examples of commensalism. Commensalism is a type of interaction where one partner is benefitted while the other is neither benefitted nor harmed.