They are fish, Atlantic Southern Stingrays, from the same class as sharks. They snarfle mollusks from the sandy ocean floor. Normally, they retreat in fear from humans, but years ago, the fishermen of the Cayman Islands made a habit of stopping off at this spotand feeding the rays leftovers from their catches. We don't feed rays, that is left to the experts. In the water, Allan, George, and Joe hold out leftovers.
Rays surround the men and look like they're chewing up their arms.
The rays aren't, but sometimes I wondered where Allan's arm disappeared while that ray flapped happily at him. In fact, George and one female ray have a hug-fest going. A ray wraps herself around George's shoulders - for him, a common occurrence. They like him. He loves them.