A DEEP sea shark with a penis that pops in and out of its forehead has been filmed in the wild for the first time.

Scientists were astonished to see a pointy-nosed blue chimaera – or ghost shark – alive in its natural habitat. 2 Credit: National Geographic

Divers trawling the 67,000 foot down in the depths of the pitch-black ocean off California and Hawaii were shocked to spot the ghost shark and its bizarre sexual organ.

Thankfully, they had brought a camera along.

Relatives of sharks and rays, these beasts were around long before dinosaurs - but scientists know little about them.

The Ghost Shark is renowned for their dead-eyed glaze as well as their winged fins.

Oh, and the penis protruding from the male species' head.

We don't quite know how the males use their willies, which "resemble a spiked club at the end of a stalk".

They may be used to ensnare women and pull them closer, or may play a softer role in stimulating her own sexual organs.

2 Credit: National Geographic

But because no-one's actually caught the beasts in the act of physical love, we don't know for sure.

Dave Ebert, program director for the Pacific Shark Research Center at Moss Landing Marine Laboratories said the divers stumbled on the shark by accident.

He said: “It’s almost a little comical.

“It would come up and bounce its nose off the lens and swim around and come back.”

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Their odd-shaped faces are also helpful when it comes to finding lunch.

They contain a map of line canals that can sense movement in the water to find food.

The Monterey Bay Aquarium Research Institute in California shared the video of the fish in their natural habitat with National Geographic.

It follows the spate of two-headed shark sightings that have got fishermen spooked.

The mutants are becoming more common in the wild and nobody has any idea why.

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