Only humans and a handful of other primates will attempt to make peace between warring third parties. But now there is a new diplomat on the block: the cleaner wrasse. Cleaner wrasse (Labroides dimidiatus) feed on the parasites that attach themselves to the outsides of other fish, and even throw in a calming massage with their pectoral fins. In return for the services, client fish don't attack their cleaners and return regularly to their territories to supply them with more food. (source: nature.com)
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