The iconic sea creature feeds on plankton well beneath the surface, isotope analysis shows.
The giant manta ray prefers to eat plankton in the deeper ocean rather than food at the surface, research has found. These plankton-feeders – or planktivores – can measure 7 metres across (23 feet). Their habits have proven elusive to biologists. Most information on the giant manta ray’s diet has come from chance observations at the sea surface in daylight. Read more.