I'm not sure about how whales work. Another thing about mantas is that they give live births and their gestation goes over a year!
I'm not sure about whales. I also found it fascinating that manta rays gestation period last over a year!
Have you ever swam with a manta ray? I saw some while snorkeling once. Never, that sounds interesting though, the manta rays belong to the "Manta" genus as well! Yes I have been in the water with rays before. They are majestic creatures. Where were you in the water when you encountered the ray? I know they are found in temperate, subtropical and tropical waters. I was in Cozumel Mexico. We were on a snorkeling trip and say a school of eagle rays. They move so smooth and gracefully through the water. Sounds neat! Have you heard that they're filter feeders too? They swim with their mouths open and swallow zooplankton, which they eat large amounts of. I did not know that, don't whales eat in a similar manner?
Gestation lasts over a year and mantas give birth to live pups.