BBC:

Closely related to sharks but with long, flat bodies and wing-like pectoral fins, they are ideally suited to swooping through the water yet seem equally at home in the air, so much so that they have earned the name “flying rays”.

Mobula rays can reach heights of more than two metres (6ft 6ins), remaining airborne for several seconds, but their landings are much less graceful, creating a loud bang as they belly-flop back into the sea.

The video on this page is spectacular. I’d love to go scuba diving with this group but I’d be afraid of a 5.2 m (17 ft), 2,000 lbs ray landing on me.