I can't remember if I saw it in a cartoon, a documentary, or both, but the notion is that the clients of cleaner fish wait in line to be cleaned. "Clients" means the fish (or other aquatic animals) who are cleaned by cleaner fish.

I tried to find a study whose sole purpose is to confirm that client fish wait their turn to be cleaned by cleaner fish, but I only found articles that seem to refer to this while studying other cleaner fish behaviour.

Statements I came across that support the notion:

Do fish wait in line to be cleaned by cleaner fish?

Side question: Is this an example of reciprocal altruism?


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