The Humane Society started a "Save the Abandoned Chimps" Facebook page, which has nearly 10, 000 followers.
These chimps have served as laboratory chimps for many, many years and suffered psychological trauma.
So far, the team have only found this behaviour in chimps in the Goualougo Triangle.
Instead it seems that the Goualougo primates are learning the crafting techniques from other chimps.
Few species land on their heel: bears, humans and great apes -- chimps, gorillas, orangutans.
Cameroonian chimps got the virus probably many thousands of years ago by killing and eating monkeys.
Let the chimps chatter while we focus on buying cheap stocks of good firms.
The business people on the course certainly see similarities between the chimps and people they know.
Moreover, it seems to have made the jump from chimps to people only once.
However, chimps, when presented with the same scenario were happy to wait and team-up.
Certainly more memorable than most of the commercials, which didn't even star any funny chimps.
Female chimps are extremely promiscuous and males, therefore, have little idea who their children are.
Putting wigs and dresses on chimps is no longer acceptable, nor are shoddy exhibits.
The chimps are fed a good diet of vegetables, have toys and plenty of space in which to play.
He said the bonobos were probably more vulnerable than common chimps and lowland gorillas.
BBC: NEWS | Science/Nature | Fences 'can help apes' survival'
The big question though is whether the effect lasts when the chimps are taken off the medication.
The medication has been steadily reduced and there has been no adverse effect on the chimps' behaviour.
As for chimps, they get to enjoy their first eight to 10 years with direct human interaction.
"It seems that while on the medication, the chimps learn to be chimps again, " said Dr Kranendonk.
Many areas where chimpanzees live are also home to the red colobus monkey, which the chimps hunt.
Allegedly, the vaccine makers grew the polio virus in kidney cells from chimps infected with the virus.
Slocombe and Zuberbuhler then ran an experiment to see if the chimps could tell the difference too.
For some time now, primatologists have paid more attention to the hands of chimps than their mouths.
And they were affected more by yawns of their group members than by those of unfamiliar chimps.
BBC: Earth News - Chimpanzees 'catch' contagious yawns from friends
That prevents unwanted competition from females and allows them to have more sex with other chimps undisturbed.
After decades of being research animals, the chimps unsurprisingly looked weary and dishevelled, even after their anti-depressant treatment.
The sanctuary is also home to other retired animal actors, including orangutans and monkeys as well as chimps.
Gorillas, orangutans, and other chimps live with him in the compound, and Caesar quickly becomes a leader of apes.
The result, which Dr Jensen reports in Science, is that chimps are simply rational maximisers Pan economicus, if you like.
Experts have recorded over 40 different types of stone tool use in chimps.
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