If you have any experience diving in the tropics, you’ll know cleaner fish quite well. It’s the little black and white blighters that pick at any unprotected sores you may have. Some divemasters like to entertain their customers by taking out their regulators and letting cleaner fish pick their teeth. All very well.
I thought I knew everything about cleaner fish until I saw this!
A knowledgeable diver suggested the phenomenon might be akin to the neural paralysis and immobility displayed in some sharks when they are stroked in a particular way.
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