Secret laboratory projects to breed 'humanzee' man-ape super soldiers have been ongoing for years, it is claimed.
The odd projects are aimed to create hybrid animals that have underdeveloped brains but immense strength along with being resilient and resistant to hunger.
According to the Daily Star, news of a mysterious "hybrid monkey" which has DNA from two different species shook the science world last week.
The creature, which appears to be combined from two different species, was seen in Malaysian Borneo near the Kinabatangan River.
A new study suggested that the hybrid creature is competing for forest space. However, a decade ago a more unusual breeding project was attempted.
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Plans were in place to try and create a creature that was a mix between humans and other animals to supplement the armed forces along with making a 'factory' for transplant organs.
Joseph Stalin ordered Soviet scientists in Russia to create a hybrid ape-man 'super soldier' in the 1920s.
He wanted the creature to be able to work under extreme conditions that would be deemed too dangerous for humans.
Documents that were declassified in the 1990s appear to show that Kremlin chiefs were trying to make an 'unbeatable' army of man-apes.
They wanted hybrids to have "immense strength but with an underdeveloped brain” who were "resilient and resistant to hunger".
Biologist Ilya Ivanovich, led the 1920s project focused on cross-breeding apes and humans by using artificial insemination.
After the project was unsuccessful, the idea of developing a 'humanzee' didn't resurface until the 1970s when a 'mutant' chimp, who had human characteristics, was created.
Given the name Oliver, it was reported that the ape was a human–chimpanzee hybrid that had less body hair than other animals but was much more intelligent.
Although it showed in a post-mortem that the hybrid had the same genetic makeup as any normal chimpanzee.
A few years later, reports had emerged in the 1980s that experiments of human-chimpanzee crossbreeding had gone on in 1967 in the People's Republic of China.
Dr Ji Yongxiang, one of the scientists involved in restarting the project, spoke to the Wen Hui Boa newspaper about his aim for the project.
He revealed he wanted to produce a creature that retained the strength of a chimpanzee but was able to talk.
The 'humanzees' would have been used for a series of different purposes such as mining and heavy agricultural work.
They'd also explore dangerous environments such as outer space and the depths of the ocean.
A human-monkey hybrid that was created in 2019 by a team of scientists led by Professor Juan Carlos Izpisua Belmonte from the US Salk Institute for Biological Studies, reportedly was alive for 19 days.
However, as there have not yet been any authenticated cases of genetically-engineered ape-men being successfully produced, the Borneo ape will continue to remain the fascination of scientists within this field.
Researchers have concluded that the monkey has most likely been the result of two distantly related species that share the same habitat; a proboscis monkey (Nasalis larvatus) and a silvery langur (Trachypithecus cristatus).
Study author Nadine Ruppert said: "We concluded from the observations that the photographers made that male proboscis monkeys are mating with female silver langurs in the area and that there are mixed groups where female proboscis monkeys even take care of silver langur babies."