World's strangest sharks and rays 'on brink of extinction'
Some of the world's most unusual sharks and rays are on the brink of extinction because of threats such as commercial fishing, scientists have said.
A shark that uses its tail to stun prey and a ray half the length of a bus are on the list of 50 species.
The scientists say sharks have a bad image and people do not understand how important and threatened they are.
And losing even one of these "living fossils" would wipe out millions of years of evolutionary history.
"The biggest myth around sharks is definitely the perception that they are dangerous, that they are man-eating machines - they're not," marine biologist Fran Cabada told BBC News.