A zoo
orangutanalmost broke a man's leg after it grabbed him and tried to drag him through a cage.
It is seen with both hands and a foot around the victim and its tight grip is adamant not to release him while another man tries to rescue him.
There is no indication of when the footage was taken but it prompted a huge reaction and Reddit and immediately went viral after being posted.
The man is seen standing near the
orangutan'scage and the animal, which is thought to be female reaches out and grabs him by the T-shirt.
It pulls him towards the bars of the enclosure and then manages to grip hold of his leg.
The ape lifts him off the ground and uses its feet to get a tighter grip on the bars.
It is not known if the man suffered any injuries but those commenting on the online video said an ape could could easily cause harm to a man.
A poster on Reddit said: "When the orangutan starts grabbing him with his feet it becomes next-level terrifying."
Someone lese who watch the clip said: "I don't know how strong orangutans are but I was pretty worried it was gonna break his leg."
Another said: " Google people who have been attacked by apes. They are strong enough to rip you to pieces.
"And they go for your face and your hands first."
The visitor was also criticised for getting too close to the animal while others and said the ape should not bein a cage.
One said: "All things considered, he would have probably have been OK.
"Orangutans are one of the more docile apes out there. Not one recorded death of a human from an orangutan.
"This orangutan was clearly agitated, but he didn’t seem to want to do any serious harm from what I could see, but then again I’m no expert."
Experts say orangutans are around seven times stronger than humans and are able to lift three times their body weight and have long muscular arms.
A non-profit organisation in Indonesia is preparing baby orangutans for life in the wild by teaching them survival skills such as awareness of dangerous snakes, how to climb trees, build nests and forage for food.
The Mirror told in April how NGO, Borneo Orangutan Survival (BOS) Foundation, takes in orangutans that have been displaced from their forest homes, and they need to be trained before they can be released back into the wild.
The keepers teach them by acting out the scenes themselves - leaping back when they spot a snake and causing a panic that makes the great apes shoot up nearby trees.
There are only around 50,000 orangutans in the wild after the destruction of much of their jungle home in Indonesia.
But despite the zoo visitor's ordeal, there have been no recorded fatal attacks on humans.
