This beautiful fellow is a Mobula Ray. They have graced our seas, undulating hypnotically for millions of years. We once thought these filter feeders were passive plankton eaters. That is mostly true but not always true. They do swim with their mouths open, taking in the wee micronutrients the ocean has on offer, but they also gather to hunt in the high seas.
I saw a wonderful expose, the Blue Planet, earlier this year with David Attenborough as narrator. The program showed some wonderful footage with great pods of dolphins, 10,000 members strong, pushing deep-sea Laternfish up from the depths to dine upon them. Once the dolphins and trailing Tuna had had their fill, rows of Mobulas swooped in with their mouths open to feast on these small mesopelagic fish. The water was a frenzy of fish scales and the aptly named 'Flying Mobulas.' They were an impressive sight, arriving in tight formation to best capitalize on a beautiful feast.