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Message:

> They attach  mainly to sharks and eat host feces:
> 
> https://en.wikipedia.org/wiki/Remora
> 
> But it is their sucker which is so interesting:  
> 
>   https://cosmosmagazine.com/biology/this-fish-is-a-sucker-but-no-fool?utm_source=Cosmos+-+Master+Mailing+List&utm_campaign=194472c7e2-RSS_EMAIL_CAMPAIGN&utm_medium=email&utm_term=0_3f5c04479a-194472c7e2-180344213
> 
>   " The unique remora fish (order Carangiformes) – appropriately also known as the suckerfish or sharksucker – has such a powerful suction disc on its head that it can stay attached even to fast-moving sharks and leaping dolphins. 
> 
> "Chinese scientists have now discovered how it works and, with colleagues in the US, have started adapting the same approach for use in robots. 
> 
> "A team led by Li Wen of Beihang University looked into the tissue on the soft lip of the remora’s disc and found a unique structure: vertically oriented collagen fibres that provide elasticity for maximising contact with substrates and decrease the deformation of the lip to maintain its adhesive force.  
> 
>  "Inspired, they engineered a biomimetic disc infused with vertical nylon fibres with electrostatic flocking, a technique that utilises an electric charge to align fibres. "
> 
> Comment: as usual evolution produces new ideas for us to use. How did this develop? Not  trial and error. It had to be designed.