The enrichment habitat was then opened for use by other chimpanzees.
According to researchers, any test on Oliver would not have given viable results because of his uniqueness.
He's even come up with names for these hybrids.
Chimpanzees and other apes are often captured from the wild for commercial purposes even today.
Results of further studies with Oliver were published in the.
The male hybrid, however, turned out to be sterile.
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Gallup, who developed the famous mirror 'self-recognition' test which proved primates could acknowledge their own reflection, coined the term 'humanzee' which refers to a human-chimp crossbreed.