Cleaner fish exhibit a specific inherited variation involving a characteristic waggling swim to safely clean big predator fish, demonstrating facultative behavior.
Cleaner fish have a specific inherited variation where they perform characteristic waggling swim to inhibit the feeding response of big predator fish. This adaptation allows them to enter the predator's mouth safely for cleaning. The adaptation of the cleaner fish is facultative as they can choose to engage in this behavior based on the situation.
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