The beautiful but rare animals were captured on camera by photographer Arthur Xanthopoulos.
The 39-year-old spent six months at Melbourne Zoo following and photographing the endangered cats, to raise awareness about these magnificent animals.
It is feared their numbers have tailed off in recent years and there are now as few as 400 of the fierce felines struggling to survive on the Indonesian island.
Arthur said: "The mission of my tiger project is to provide a photographic document of these magnificent animals as a species and as individuals.
"I hope that people will see why it is important to ensure the survival of the species currently under threat.
"These incredibly beautiful tigers face danger through human impact on their environment and through poaching."
Although illegal, the poaching of wild Sumatran tigers still occurs. A fully-grown nine foot-long adult can fetch around £17,000 on the black market. In China tigers are believed to have mystical healing properties.
The Sumatran tigers at Melbourne Zoo are part of a breeding program to increase their population size.
This has seen some success, with proud nine-year-old mum Bin Jai giving birth to four cute cubs in February last year.
Arthur said: "They present challenges in photographing them since they rarely sit still. Their enclosure is very much a rain forest environment so as you can imagine they're not always readily available to be photographed.
"I think I've managed to succeed to some degree in creating that awareness."
