Region Philbis wrote:maybe it's a copy-cat?
Maybe. But Mantas and Dolphins are very different animals. I know mammals engage in play (they have big brains), but I'm not sure Mantas do the same thing.
Whales breach as part of feeding (bubble netting), and they also seem to breach for play and for signaling (communication). Sharks only seem to breach as part of feeding (attacking seals from below at high speed propels them into the air).
I'm not even sure what all mantas eat. I know the big ones are filter feeders, and the bottom feeders eat mollusks and worms and stuff, but I'm not sure if any mantas pursue fish.