Cleaner fish

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

Cleaner fish are fish that show a specialist feeding strategy by providing a service to other species, referred to as clients, by removing dead skin, ectoparasites, and infected tissue from the surface or gill chambers.

Excerpt from the Wikipedia article “Cleaner fish”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Silke Baron, CC BY 2.0, via Wikimedia Commons.