This video was filmed by the author during a visit to the Sea World, California, USA.
As shown in the video, visitors surrounding the touch tank are trying and actually touching the stingrays which is a unique experience.
In order to ensure a safe touch, the barbs (stingers) of rays are constantly trimmed down like trimming fingernails, so the de-barbed stingrays are safe to interact with and touch. According to large aquariums, the trimming process is done every three months whereas each ray is gently taken out of the water to trim the barbs for about 10 seconds.
