When watchingJurassic Park , what do you think is more frightening , Tyrannosaurus king ’s spike - splitting roar or the anticipatory David Low , grumble thud of its footsteps ? If you consider the low gang fight , you are closer to the truth , according to a new BBC documentaryThe Real T - Rex .

train to explore the “ astonishing truth ” about everyone ’s preferred fearsome beast after days of misrepresentation by vexatious Hollywood studios ( to quoteJurassic   World : " This creation exists to action a incarnate mandate   –   they require somethingbigger , louder , withmore tooth . " ) researchers have created not only the most exact CGI representation of aT - rexever , but also what they think it would have sounded like too .

“ The most shivery noises in the born world today come in from predators , the ululation of the wolf , the bellow of the Panthera tigris , but experts now doubt thatT - rexsounded anything like them , ” say television set presenter and natural scientist Chris Packham , who fronts the show , theTelegraph cover .

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So if not the rip - curdling thunder of moviedom , then what ?

Researchers at the University of Texas , led by Professor Julia Clarke , quiz the theory that dinosaur may have actually go a great deal more like their chick and reptile relations than forward-looking predatory mammals .

By combining the booming call of the Eurasian bittern with the growling vocalizations of the Chinese crocodile , and then scaling it up toT - rex’sestimated size ( about 12 meters or 40 feet long ) , what they get was a terrifyingly ominous low rumble that rear the hair on the back of the neck opening .

" This could be the first   meter in 66 million years that this sound has been heard on Earth , " Packham sound out in the clip above . " It ’s a gibe in the dark , but we are using the best grounds we ’ve generate . "

“ I feel like this sound just cause fear , ” Clarke respond . “ masses think you need a roar to be really scary , but is n’t that the scariest strait you ’ve ever heard ? "

The researchers draw it as a blue rhythmic thud , similar to the strait you often get in horror   movie euphony , because low - frequency dissonance , which is often felt as well as heard , is more frightening , or even potentially paralyzing , than high - frequency noise .

StudyingT - rex’sinner ear showed that it was also particularly sensible to depressed - frequency sounds , which can journey through the reason , suggesting that this may have been how the creatures " babble out " to each other over long distance , much like elephants and whales do .

The program also explore howT - rexreally would have reckon like , prompt , and behaved .   you may watchThe existent T - Rexon BBC iPlayerin the UK , and on BBC Worldwide at a later escort to be confirmed .