Had never seen these before except in photos. Nine of them hung around the pier, even touched them while snorkeling. They are very used to tourist. There were also large schools of bonefish, but they were more wary of us.
Saw a large starfish while snorkeling and dove to pick it up. I felt a "flutter" and knowing that starfish don't do that I jerked backward. When the water cleared, this is what I saw (less the arrow of course!)!