[dayglored]

The Wikipedia article on stingrays mentions that rays in aquariums that allow handling have their stingers removed with pliers. The article doesn't mention that they grow back or have to be removed periodically.

"... Where there are stingray touch tanks where visitors can "pet" rays or when show divers routinely hand feed rays in giant saltwater exhibits, for diver and visitor safety the barbs on the rays are snipped off with a pair of pliers. The tip of the barb is then presented as a harmless stub that can't penetrate the skin of visitors or divers who routinely handle the docile rays..."

Of course, it doesn't say that it -doesn't- grow back either... Anyway, my comment was a presumption, and I shouldn't have worded it as if it was definitive.

[The Red Zone]

How about raycaps, like the nailcaps for cats.