Manta rays (Mobula birostris) will deliver one offspring after a long gestation period of over a year, although, in some cases, twins may be born. A study into how these fish breed is underway to see how conservation measures could be put in place to help the population thrive. One Planet. Seven Years. A story not yet written. #ChangingPlanet will document how the Earth’s most vulnerable habitats, and the animals living there, will evolve in the coming years. Find out more 👉 bbcearth.com/shows/changing-planet Subscribe: bit.ly/BBCEarthSub Watch more: Planet Earth bit.ly/PlanetEarthPlaylist Blue Planet bit.ly/BluePlanetPlaylist Planet Earth II bit.ly/PlanetEarthIIPlaylist Planet Dinosaur bit.ly/PlanetDinosaurPlaylist Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and e...