In coral reefs, small "cleaner" fish eat parasites clinging to large fish. These large fish protect the cleaner fish from predators. This is an example of

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This is an example of reciprocal altruism because the small "cleaner" fish provide a service to the larger fish by removing parasites, and in exchange, the larger fish protect them from predators. Both parties benefit from this interaction, and it is based on trust and cooperation between individuals.

In Coral Reefs, Small "Cleaner" Fish Eat Parasites Clinging to Large