Known as the "Queen of Mantas," Andrea Marshall has studied the graceful swimmers for more than a decade. Here's how you can join her on an expedition. https://on.natgeo.com/2ZqxkDE

Known as the "Queen of Mantas," Andrea Marshall has studied the graceful swimmers for more than a decade. Here's how you can join her on an expedition. https://on.natgeo.com/2ZqxkDE 

https://twitter.com/NatGeoTravel/status/1139110294993690624