Secret world of the giant manta ray
World of mysteries: the oceans and its creatures
Science does not reach the mysteries that Nature hides!
Nature also reacts to attacks
Mantas could be one of the most intelligent creatures in the ocean
Until recently it was thought there was only one species of manta ray but Dr Marshall realised many of the rays - that can grow up to 23ft long - displayed different markings and behaviour.
Film crew dives into the incredible secret world of the giant manta ray
Gliding through the oceans like ghosts these mysterious manta rays have been captured in unique footage filmed off the coast of Mozambique.
The results of a tagging study showed that one of the giants Magellan swam 700 miles in 60 days
The 30 year old researcher concluded she was observing two separate species of mantas - one of them totally new to science. The larger mantas kept the name Manta birostris, while Dr Marshall named the reef-going mantas Manta alfredi, after an early biologist.
The experienced diver has been based in the coastal African country since 2003. She spent last year swimming with the black-winged creatures alongside a film crew for a BBC documentary.