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Today, the distribution areas of the western and the eastern gorillas
are separated by almost 900 km. The reason for this is probably that
a formerly uniform area was split at some point, most likely during the
ice ages. At that time, climatic changes caused the rain forest to shrink
into a few refuge areas. The savannah, which spread between these refuge
areas, was not an appropriate habitat for gorillas. Later, when the rain
forest spread again over the whole of the African tropics, gorillas could
only advance to the Ubangi and Congo Rivers.
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