This magnificent creature is a Spotted Eagle Ray (Aetobatus narinari).  With a wing span of up to 8', they glide gracefully about with an almost hypnotic ease.  They are extremely shy and thus very difficult to photograph.  The only I was to get this photo was that I remained still while Wesley went off and kind of herded him in my direction.  I was eyeball to eyeball with him when I took this photo, so close that the venomous spines at the base of his tail are clearly visible here. 

This rather smallish ray was so intent on feeding that he was oblivious to my presence.  He came to within about 3' of me when I got these shots.  They are very messy eaters, repeatedly plunging their elongated snout into the sand first to liquify it and then to be able to filter out any small crustaceans they might find.  The mouth is well aft of the prow of their beak, very much on their underside.  It is an interesting sight to watch the sand pouring out of the gill openings on the sides of their heads while they are filtering the sand.