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Using time-lapse recordings to investigate the diversity of the remote Wehea forest, the team were surprised to see an unusual sub-species.
Close analysis confirmed that they had photographed a group of Miller's grizzled langurs.
Fears for the monkeys' future were sparked last year when none were recorded in previously known habitats.
The international team of researchers suggest their evidence could indicate a more optimistic future.
"Our findings confirm that indeed this monkey still lives in the forests of Borneo and we found that its range extends farther inland than scientists had previously thought," said PhD student Brent Loken from Simon Fraser University, British Columbia, Canada.
"This gives us hope that we may still be able to find large enough populations of this monkey to ensure its survival."
The team's findings are published in the American Journal of Primatology.
Populations of Miller's grizzled langurs were first described in Kutai National Park and Sangkulirang Peninsula, East Kalimantan, Indonesia, in 1985.
However, due to habitat loss and hunting, subsequent studies recorded falling numbers of the monkeys in these areas with no activity recorded last year.
Scientists from Indonesia, the Czech Republic, US and Canada worked together to set up hidden cameras so they could learn more about the animals living in the rainforest.
Stunned by the results of their initial camera-trap study, scientists returned to the location to photograph the little-known monkeys in greater detail.
"It was a challenge to confirm our finding as there are so few pictures of this monkey available for study," said Mr Loken.
"The only description of Miller's grizzled langur came from museum specimens. Our photographs from Wehea are some of the only pictures that we have of this monkey."

The judgement could relieve pressure on other foreign companies facing similar tax investigations in India.
The case centred on Vodafone's $11bn acquisition of the Indian assets of China's Hutchison Telecommunications in 2007.
Vodafone said it did not owe tax on the deal, as the assets were held by a firm based in the Cayman Islands.
In May 2007, Vodafone's Dutch subsidiary acquired a 67% stake in CGP Investments Ltd, a Cayman Islands registered company which held the Indian telecom assets of Hutchison.
It was presented with a tax demand of 112 billion rupees, currently worth $2.2bn. The Indian government subsequently sought penalties of up to 100% of the original bill.
"The court has concluded that Vodafone had no liability to account for withholding tax on its acquisition of interests in Hutchison Essar Limited (now Vodafone India Limited) in 2007," the company said in a statement.
Wider impact "This settles a prolonged litigation which had created a lot of uncertainty for multinationals," said Sandeep Ladda, executive director at PricewaterhouseCoopers in India.
GE, SAB Miller, Cadbury, AT&T, Sanofi, and Vedanta are among the firms which may be affected by the ruling.
"This should provide much needed respite to other litigants in other cases," he added.
Advocates of higher corporate taxation, however, were disappointed by the judgement.
"This is deeply harmful," said John Christensen, Director of the Tax Justice Network and author of a book on offshore tax havens.
"It will simply encourage all other companies around the world to use offshore structures to avoid tax," he added.
However, the legal precedent may be short-lived.
Rising revenues India's new tax code, due to be implemented in 2013, contains provisions designed to make transactions similar to Vodafone's liable to tax.
Developing markets such as India are increasingly important to the UK-based telecoms giant.
The firm lost £9m in India in the six months to 30 September, but saw revenue increase by 18.4%.
The country accounted for 9% of the firm's total revenues during the period.

The European Aviation Safety Agency (EASA) said the planes, a third of the current fleet, would undergo a "visual inspection" for cracks.
A few planes, which have carried out more than 1,800 flights, will need inspections within four days, it said.
Airbus said the cracks were not an immediate threat to safety. If cracks are found it will carry out repairs.
The problems could affect planes operated by Singapore Airlines, Emirates and Air France.
Cracks The agency said it has determined that the cracks may develop on aeroplanes after a "period of time" in service.
"This condition, if not detected and corrected, could potentially affect the structural integrity of the aeroplane," said the agency in its directive ordering the inspections.
This is the second set of cracks found on A380 wings.
The first, which were less serious, emerged during repairs to a Qantas A380 following a blowout of its Rolls Royce engine in November 2010.
That prompted more widespread investigations and more serious cracks were found in the UK-made wings on Thursday.
If more, similar, cracks are found aircraft may be grounded in order to carry out a repair programme agreed between Airbus and regulators.
Repairs Only planes which have carried out more than 1,800 flights are being targeted urgently, those which have flown between 1,300 and 1,800 flights must be tested within 6 weeks.
"Airbus confirms that during routine inspections some additional cracks have been found on a limited number of non-critical brackets (known as rib-skin attachments or wing rib feet) inside the wings of some A380s," the company said in a statement.
However EASA warned further steps may be needed.
"As a result of the on-going investigation, further mandatory action might be considered."

The author had been due to speak at the Jaipur literature festival.
He said he had been told by sources that assassins "may be on the way to Jaipur to kill me".
Salman Rushdie sparked anger in the Muslim world with his book The Satanic Verses, which many see as blasphemous.
He lived in hiding for many years after Iran's Ayatollah Khomeini issued a fatwa calling for his execution.
The author had been scheduled to speak on the opening day of the five-day Jaipur event which began on Friday, but earlier this week organisers said his schedule had changed and took his name off the list of speakers.
"I have now been informed by intelligence sources in Maharashtra and Rajasthan that paid assassins from the Mumbai underworld may be on their way to Jaipur to 'eliminate' me," Salman Rushdie said in a statement read out at the festival.
"I will therefore not travel to Jaipur as planned."
'Stain on India' The writer later tweeted that he was "very sad not to be at Jaipur" and that he would speak at the festival over a video link.
"I was told Bombay [Mumbai] mafia don issued weapons to two hitmen to 'eliminate' me. Will do video link instead. Damn."
Author William Dalrymple, who is also a festival organiser, said Salman Rushdie's decision to stay away was a "great tragedy".
"This is a result of a tragic game of Chinese whispers. We hope he will return to the festival," he added.
Author Hari Kunzru tweeted that Rushdie's absence from the festival is "a stain on India's international reputation".
Salman Rushdie was born in India but is a British citizen and has lived in the UK for most of his life. In recent years he has made many private visits to India and attended the Jaipur Literary Festival in 2007.
Correspondents say the protests against this year's planned trip are linked to crucial state elections due in Uttar Pradesh.
Correspondents say no political party wants to antagonise the Muslim community, which constitutes 18% of voters in the state, India's largest.
On 10 January, a leading Islamic seminary in India, Darul Uloom Deoband, called on the government to block Salman Rushdie's visit as he "had annoyed the religious sentiments of Muslims in the past". Darul Uloom is based in Uttar Pradesh.
Meanwhile, the Jaipur festival got under way on Friday amid tight security. More than 250 authors and a number of celebrities are participating.
Tens of thousands of people are expected to attend the festival, which is being attended by authors Michael Ondaatje and Ben Okri, playwright Tom Stoppard, journalists David Remnick and Philip Gourevitch and TV host Oprah Winfrey, among others.

Brian Shivers, 46, from Magherafelt was convicted of the murders of Mark Quinsey, 23, and Patrick Azimkar, 21.
The soldiers were shot dead as they collected pizza in March 2009.
Shivers' co-accused, Colin Duffy, 44, from Lurgan was earlier acquitted of murdering the two soldiers.
Shivers was also found guilty of six counts of attempted murder and one of possession of two firearms and ammunition with intent to endanger life.
Mr Duffy faced the same charges and was acquitted on all of them.
In his judgement on Brian Shivers, Judge Anthony Hart drew attention to Shivers' role in attempting to dispose of the getaway car used in the murders.
He said there could be no doubt that the person who set fire to the Cavalier played an essential part in the murderous attack because by setting fire to the car they were trying to destroy it, and so destroy any evidence that might lead to the arrest of those involved.
He said that he was satisfied that Shivers' DNA was found on the two matches found on the back seat of the Cavalier, and that those matches were used to set fire to the car before all those present left the scene.
He also said that Shivers had lied about his whereabouts and actions on the night of the murders.
Judge Hart concluded: "I am satisfied that the prosecution has proved beyond reasonable doubt that Shivers set fire to the Cavalier at Ranaghan Road and I therefore find him guilty on each count on the indictment."
Insufficient Acquitting Colin Duffy, Judge Hart told Antrim Crown Court that he was satisfied that Mr Duffy's DNA was found on a latex glove tip inside the car and on a seat buckle but he said the prosecution had failed to link the defendant to the murder plot.
He said: "There must be strong suspicion that Duffy did know what was going to happen and that that is why he has refused to give evidence.
"However, suspicion, no matter how strong, is not sufficient by itself to establish guilt beyond reasonable doubt, and is not an acceptable substitute for facts from which guilt can be properly proved.
"I consider that there is insufficient evidence to satisfy me beyond reasonable doubt that whatever Mr Duffy may have done when he wore the latex glove, or touched the seatbelt buckle, meant that he was preparing the car in some way for this murderous attack.
"And I therefore find him not guilty."
Sappers Mark Quinsey, from Birmingham, and Patrick Azimkar, from London, had been due to travel to Afghanistan hours after they were murdered.
The dissident republican group, the Real IRA, claimed responsibility for the attack, which left several others injured.
The Real IRA was born out of a split in the mainstream Provisional IRA in October 1997, when the IRA's so-called quartermaster-general resigned over Sinn Fein's direction in the peace process.
It carried out the worst single atrocity of over 30 years of violence in Northern Ireland when it bombed the County Tyrone town of Omagh, killing 29 people, in August 1998.

It is the third time the search has been called off, amid fears the ship could suddenly slip into deeper water.
Choppy waters have been hampering the work of rescue teams and weather conditions are expected to worsen.
Earlier, a video emerged showing the crew of the stricken vessel assuring passengers nothing was wrong.
In the amateur footage, a crew member says "everything is under control" and asks passengers to go to their cabins despite the fact that the cruise ship had begun taking in water.
It is thought the delay in deciding to abandon the ship may have cost lives.
At least 11 people died after the Costa Concordia ran aground off Italy's coast exactly a week ago with some 4,200 people on board.
Deeper water The ship's movements have twice before interrupted the work of rescuers, with the search suspended almost all day on Wednesday.
More movement on Friday forced rescuers on board the vessel and divers working in the waters around it to stop work, said a spokesman for the coastguard, Cosima Nicastro.
Investigations were under way to assess the danger posed by the ship's instability, he said.
The ship may have only moved by a metre or as little as a few centimetres, but officials are wary of any movement that could push it into much deeper water nearby, says the BBC's Alan Johnston at the scene.
He says it will be another agonising delay for the relatives all around the world of those still missing.
But hopes that any survivors remain on board the wreck have faded and pressure is building to move into the recovery phase of the operation.
One of the key tasks will be to begin siphoning off 2,300 tonnes of fuel oil thought to be in the ship's 17 tanks to prevent it leaking into pristine waters. That operation reportedly could take two weeks.
The latest amateur footage was posted online by Italy's Rainews24 on Thursday.
'Under control' In it, a female crew member is heard telling passengers: "We kindly ask you to return to your cabins, or go for a walk in the hall, if you like."
She says that she is relaying a message from the commander.
"We'll resolve the electrical problem that we have with the generator. Everything will be fine. If you want to stand here, it's fine.
"But I'm kindly asking you to go back to your rooms, where you'll be seated and tranquil. Everything is under control."
The footage comes from the period after the ship hit the reef when it was obviously in trouble, our correspondent says.
Even putting the best gloss on this statement from point of view of Capt Francesco Schettino - perhaps he was thinking the ship's pumps could cope with the incoming water - it would still seem unwise to tell passengers to go down into the depths of the ship to their cabins, he says.
In an audio tape following the collision aired on Thursday, a crew member is heard describing the situation on board to a port authority official simply as a "blackout" - leaving the impression, our correspondent says, that the crewman failed to relay the gravity of the situation.
But in another account, a Moldovan woman and former employee of the cruise company who says she was on the bridge after the ship ran aground has defended the captain.
"I've heard through Russian media that the captain was the first or one of the first to leave - but that's not true," Domnica Cemortan tells Moldovan TV.
"I'm a witness... I can say that I left the deck at 23:50 following an order from the captain himself."
The reports say investigators are trying to speak to her.
Captain's denials Capt Schettino is under house arrest on suspicion of multiple manslaughter.
The owners say he was sailing too close to Giglio on an unauthorised course.
Prosecutors have also accused him of fleeing the ship before evacuation was complete. He denies the accusations.
However Italian media have said Capt Schettino did admit to making a navigational error.
He also reportedly said the crew had decided to sail close to the island to salute a former colleague.
The company that owns the ship, Costa Cruises, has suspended Capt Schettino and withdrawn an offer to pay his legal costs, according to reports.

Another 16 French soldiers were injured, some seriously, in the incident in Kapisa province.
An official told the BBC that an Afghan non-commissioned officer got into a "verbal clash" and opened fire.
President Nicolas Sarkozy said France was suspending its training programmes in Afghanistan following the attack.
He was sending his defence minister, Gerard Longuet, to the country immediately, he said.
He said it was unacceptable for French troops to be fired on by their allies.
Mr Longuet said that the French soldiers shot dead were unarmed and were "literally murdered".
A Taliban spokesman said it was not clear if the attacker was a member of their group but described him as a "conscientious Afghan soldier".
Thursday's incident, in the Tagab district, took place at 08:00 local time (03:30 GMT), according to French media reports.
A French security official quoted by AFP said the soldiers were attacked as they ended a sports session at their base.
It brings to 82 the total number of French personnel killed in Afghanistan since 2001.
An Afghan official told the BBC: "This is a tragic incident, a sad and tragic day for us and for Nato." The Afghan soldier was arrested by the French, he said.
Nato confirmed in a statement that four of its personnel had been killed, and that a suspect had been apprehended, but gave no further details.
Afghan President Hamid Karzai released a statement conveying "his deepest condolences and sympathy to the French president, families of the victims and to the French people".
The relationship between the two countries was "historic" and "honest," and a source of happiness, he said. President Karzai is due to meet Mr Sarkozy in Paris next week.
The BBC's Bilal Sarwary in Kabul says there has been an increasing number of incidents involving Afghan soldiers turning their weapons on Nato forces.
The Afghan government has failed to come up with a solution or a strategy to prevent such attacks, he says.
Five French soldiers were killed by a suicide bomb while on patrol in the Tagab district of Kapisa in July 2011.
That was the heaviest loss of French life in Afghanistan since 10 soldiers were killed in a Taliban ambush in the Sarobi area, east of Kabul, in August 2008.
2011 was France's bloodiest year in Afghanistan with the loss of 26 personnel. The risks faced by French forces have increased as the areas of the country where they are stationed have become less stable.
'Difficult decision' French troops have been part of the Nato-led operation in Afghanistan since 2001, and the country currently has 3,600 troops there.
President Sarkozy announced in July that 1,000 troops would be withdrawn from the country by the end of 2012, ahead of full Nato withdrawal from Afghanistan in 2014.
Mr Sarkozy faces re-election this year and the loss of French life in Afghanistan is a highly politically sensitive issue in France.
The socialist challenger for the presidency, Francois Hollande - who is ahead of Mr Sarkozy in opinion polls - has reiterated his position that he would withdraw French troops by the end of the year, if elected.
A senior commander with the Nato-led International Security Assistance Force (Isaf) in Kabul said he was speechless at the prospect of a potential French withdrawal. France is one of the few members of Isaf to have more than 1,000 troops in Afghanistan.
In a separate development, a Nato helicopter has crashed in southern Afghanistan killing six soldiers. The nationalities of those killed has not been disclosed but they are believed to be American.
The Taliban said they killed the soldiers, but an Isaf spokesman said there was no enemy activity in the area at the time.

The 39-year-old bus driver was admitted to hospital with pneumonia but tested positive for the bird flu virus.
The H5N1 bird flu strain has a high level of mortality, killing up to 60% of humans infected with it.
Positive tests on a dead market chicken last week prompted nearby Hong Kong's government to issue an alert.
Hong Kong authorities culled 17,000 chickens after three birds were found to have died from the H5N1 bird flu strain.
It also banned imports and the sale of live chickens for three weeks after the infected chicken carcass was found at a wholesale market.
The Shenzhen victim had not been in contact with poultry, nor travelled recently, China's Ministry of Health told Hong Kong health authorities.
In November 2010, a 59-year-old woman was isolated in Hong Kong with bird flu but survived.
In October 2011 a 29-year-old woman confirmed to have contracted the virus died on the Indonesian island of Bali.
The World Health Organization says bird flu has killed 332 people since 2003.
The virus has been eliminated from most of the 63 countries infected at its 2006 peak, which saw 4,000 outbreaks across the globe, but remains endemic in Bangladesh, China, Egypt, India, Indonesia and Vietnam.
China's Ministry of Agriculture warned last month that the bird flu virus seemed to exist widely in the poultry markets of mainland China, particularly in the south.
Research fears Such work carried significant risks and must be tightly controlled, said the WHO.
Scientists in the Netherlands and the US said last week they had discovered ways in which the virus might mutate so it can spread more easily to - and between - humans and other mammals.
The US government has asked the scientists not to publish full details, in case the information is used to produce a biological weapon.

A government spokesman said the violence in the state of Ebonyi took place between the Ezza and Ezilo peoples due to a land dispute.
Dozens of riot police have been deployed to the area, officials said.
The attacks came hours after a state of emergency was declared in parts of the country due to an unrelated spate of attacks by Islamist group Boko Haram.
President Goodluck Jonathan vowed to "crush" Boko Haram, just days after the group carried out a deadly bombing on a church on Christmas Day.
State governor visit Onyekachi Eni, a government spokesman, said the killings in Ebonyi took place after members of the Ezza group "invaded and attacked" the neighbouring Ezilo community.
"The dispute between the two communities, which started in 2008, was believed to have been settled until the latest conflagration," he said.
The state governor and police chief have visited the area to view the damage, Mr Eni told AFP news agency.
The BBC's Tomi Oladipo in Lagos say the two groups have a history of land disputes, in an area where most of the people depend on subsistence farming for a living.
Our correspondent says that while these attacks do not appear related to those by the Islamist group Boko Haram, the clashes only add to the list of President Jonathan's problems, with security forces already having their hands full trying to suppress the mounting insecurity in the north.
On Saturday, Mr Jonathan declared a state of emergency in parts of the country following the attacks from Boko Haram, including one on Christmas Day in Abuja which killed dozens of people.
The measure is in force in areas of the Yobe and Borno states in the north-east, Plateau state in central Nigeria and Niger state in the west.
International borders in the affected areas have been temporarily closed.
There is growing concern that Boko Haram - whose name means "Western education is forbidden" - has developed a presence across the region.