Mountain gorillas are descendants of ancestral monkeys and apes found in Africa and Arabia during the start of the Oligocene epoch (34–24 million years ago).
The fossil record provides evidence of the hominoid primates (apes) found in east Africa about 22–32 million years ago.
The fossil record of the area where mountain gorillas live is particularly poor and so its evolutionary history is not clear.
It was about 8.8 to 12 million years ago that the group of primates that were to evolve into gorillas split from their common ancestor with humans and chimps; this is when the genus Gorilla emerged.
Mountain gorillas have been isolated from eastern lowland gorillas for about 10,000 years and these two taxa separated from their western counterparts approximately 1.2 to 3 million years ago.
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