Not much, I think! Some stingrays leave barbs in people, kind of like bee stings, but apparently once they lose one they immediately start growing another!
I don’t think it affects them much either. Often a barb will break in the skin of the ‘victime’, but from hat I understand it has many layers of barbs and if one is lost it gets quickly replace, a bit like a shark regrows new teeth to replace lost ones (after all, stingrays and sharks are related!).
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