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Professor Chris Stringer, of the Natural History Museum, is less convinced of the length of their journey, and whether they were the first to arrive on Australia.

'Where the interbreeding event(s) between Denisovans and early modern humans actually took place are currently unknown.'I have argued that some members of the wider Denisovan population could have migrated to islands beyond the Wallace Line, where the main interbreeding event(s) with the ancestors of Australasians took place.'There is also now evidence from fossil teeth that modern humans were in southern China at least 80,000 years ago, and in Sumatra about 65,000 years ago.'So populations like those are much more likely than Denisovans to have been the first colonisers of Australia, an event now dated to at least 65,000 years ago.'A Science opinion article published in 2013 also suggested Denisovans could have reached Australia.'In mainland Asia, neither ancient human specimens, nor geographically isolated modern Indigenous populations have Denisovan DNA of any note, indicating that there has never been a genetic signal of Denisovan interbreeding in the area,' said co-author Professor Alan Cooper, director of the University of Adelaide's Australian centre for ancient DNA.'The only place where such a genetic signal exists appears to be in areas east of Wallace's Line and that is where we think interbreeding took place, even though it means that the Denisovans must have somehow made that marine crossing.'The Denisovans were first identified in 2008 as being a distinct human branch to Neanderthals and Home sapiens, although there was crossbreeding between all three.

Although this genetic trace is not a new discovery, one expert believes it shows their presence predates other humans in the area.

He is calling on future scientific work on the Denisovans and their only known home to focus on unravelling this mystery.

By comparison the Trans-Siberian Railway, the longest railway line in the world, is 5,772 miles (9,289 kilometres) long.

Professor Richard 'Bert' Roberts, director of the centre for archaeological science at the University of Wollongong, has been working for several years studying the only known home of the Denisovans.

It's a question mark still hanging there.'Professor Chris Stringer, of the Natural History Museum, is less convinced of the length of their journey, and whether they were the first to arrive on Australia.

Speaking to Mail Online, he said: 'We have to bear in mind that the Denisovan people in Denisova Cave were probably at the northern end of a distribution that stretched down through south east Asia.'So we don't have to envisage 'Denisovans' migrating from Siberia towards Australia.'it's true that many modern native Australasians have about a four per cent input of 'Denisovan-like' DNA in their genomes.'But geneticists point out that their Denisovan-like DNA must actually be from a genetically distinct population to the one known from Siberia, one that had perhaps differentiated from the Siberian Denisovans 200,000 years earlier.

An enchanting stone bracelet (pictured) made by a Paleolithic man found in the cave could could revolutionise our understanding of early human development, suggesting that technology used in its creation was available much earlier than thought The manufacturing technology used in the bracelet is seen as being more typical of a later period, for example the Neolithic era, which began around 12,000 years ago.

This image shows a hole that was drilled in the bracelet with a high-rotation drill Extraordinary examples of modern-looking jewellery made by the Denisovans at least 50,000 years ago, but suspected by scientists to be older, show their technological skills as being far advanced of Home sapiens or Neanderthals at the time Tiny fragments of their remains, including a pinky finger, were found in the world famous Denisova cave.

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