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Have you ever wondered why manta rays are always in motion? Blowfish reveals the heartbreaking reason why manta rays must keep swimming.

This clip comes from "Ocean Wonders" Season 1, Episode 2: "Manta Rays and Boxer Crabs."

About "Ocean Wonders:"
Heavy-metal marine biologist, Tom “the Blowfish” Hird, comes face to face with incredible sea creatures and conducts mind-blowing experiments to reveal the secrets and mysteries of our oceans.

Watch "Ocean Wonders" Wednesdays on EarthX.

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Transcript
00:00Meet the manta ray.
00:09There are two distinct species, reef manta rays and giant oceanic manta rays.
00:21These big beasties are giant by name and giant by nature.
00:26The mature females can grow to a whopping 8 meters, which is roughly the width of a
00:31tennis court.
00:35But the really distinctive thing about mantas is their body shape.
00:41Their unique shape is highly streamlined, making them some of the most efficient swimmers
00:46in the ocean.
00:47Plus their skeleton is made entirely of cartilage, which is lighter and more flexible than bone.
00:56But they aren't putting on this underwater ballet just for me.
01:01In fact, manta rays have to keep swimming to stay alive.
01:06But why?
01:11The reason is all to do with oxygen.
01:14As the manta ray swims forwards, the horn-like fins on the front of its face help to funnel
01:20a current of water into its mouth.
01:23Inside the mouth are five rows of gills, each is packed full of blood vessels which absorb
01:29oxygen from the water into the ray's bloodstream.
01:34The water is then expelled through the slits on the underside of its body.
01:40So the only way the manta rays can stay alive is constantly swimming forwards, to push new,
01:47oxygen-rich water over their gills.
01:50If they stop moving, they die.

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