But after further tests, the remains turned out to be from a beluga whale

Russian special forces took away the bones to conduct an in-depth study

Tests showed it wasn't the skeleton of a fish or an alligator or crocodile

With its long body, sharp teeth and fur these images show what looks like a monster out of a horror movie.

And at first people were left baffled by the skeleton of the unknown animal, which was found by soldiers washed up on a Russian beach.

The discovery prompted the Russian special forces to remove the carcass to carry out an in-depth study on the 'unknown' skeleton.

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The creature, which was found washed up on a beach on Sakhalin island in the most eastern part of Russia by soldiers

The remains appeared to show the animal once had a large mouth and sharp teeth, similar to that of a crocodile or alligator

The soldiers who discovered the bones snapped pictures of the unknown creature before it was taken away by Russian special forces

But despite the theories that it could have been the remains of a pre-historic creature, it turned out the bones were in fact from a large beluga whale.

The remains were discovered on the shoreline in Sakhalin, an island in the most eastern part of Russia, which is near to Japan.

The images of the skeleton, which first emerged in 2006, were snapped by the soldiers before it was removed from the beach by Russian special forces.

But initial tests on the bones and teeth showed that it was not a fish, while the skeleton showed that it wasn't a crocodile or alligator.

It was also said to have measured in at around 20 feet long and had skin, with hair and fur.

But after being examined by marine experts, it transpired that the skeleton was that of a beluga whale

The large fossil measured in at around seven metres long and had skin, with hair and fur

Theories on what the animal might be had ranged from a whale to a plesiosaur, a marine creature from the triassic period, before it was established it was a beluga whale

But after several marine experts took one look at the pictures of the skeleton's skull, they quickly established that it was a beluga whale.

They also released the picture of a whale's skull to show the similarity of the two sets of bones.

Before being shown to be beluga whale, theories on what the remains could be had ranged for a whale to a plesiosaur, a pre-historic marine creature from the triassic period.

Last year the remains of a similar-looking creature with a four-metre long body and horns, washed up in Villaricos, Spain.

An unfortunate swimmer stumbled across the head before coming across the rest of the body.