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u/Lactobacillus653 Aquilolamna 7d ago
Small fish, especislly wrasse and remora clean shark teeth to rid them of parasites and gunk, in which they receive a food source.
It is called a symbiotic relationship!
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u/Rhiannon1307 Basking Shark 7d ago
Cleaning. Or rather finding parasites and other edible debris and dirt. Win-win for both parties.