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/2U4eiDL

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/2U4eiDL 

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