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Anonymous hackers have launched a bid to destroy sick Danish bestiality sites, bringing down 20 disgusting pages in a matter of hours.

The hacktivist campaign is called OpNullDenmark and aims to stop websites in "the barbaric country" publishing vile "dog rape" films.

Bestiality is still legal in the liberal Scandinavian nation, sparking lurid social media claims the country hosts sick zoological sex tourists, unnatural animal orgies and even beast brothels.

We have seen a full list of the websites targeted in last night's cyberstrikes, which have disturbing-sounding names like FreeAnimalSexTube, DogSexVids, AnnasDogSex and BrazilBeastSex.

A group of hackers called the Polish Cyber Animal attacked about 20 sites and replaced their front pages with messages attacking animal cruelty, tweeting the words "TangoDown" to announce their victories.

On Twitter, hacktivists posted pictures of cruelly abused dogs which are too disturbing to publish.

"In dog brothels, the ones who die in agony are lucky," wrote one supporter of OpNullDenmark. "The rest live in agony and fear with no chance of escape."

A bestiality ban is currently working its way through the Danish Parliament.

"An animal by its very nature cannot say no," said agriculture minister Dan Jørgensen, who proposed the new animal sex laws.

"An animal by its very nature also has a hard time proving that the animal has been hurt by a sexual act. Therefore, we need new legislation that ensures that the consideration of the animal comes first."

However, some Danes do not want to give up their right to shatter wildlife sex taboos.

"Best case, this is a superficial law," said Joachim Olsen of the Liberal Alliance Party.

"Worst case, it is political populism and moralism."

The anti-bestiality campaign started last year, but this is the first time hackers have attacked websites.