silverback

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silverback

gorilla

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gorillas

In gorilla
…of the back—hence the term silverback, which is commonly used to refer to mature males. This saddle is much more conspicuous in eastern gorillas (G. beringei), which are jet black, than in western gorillas (G. gorilla), which are more of a deep gray-brown.
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human evolution

In human evolution: Learning from the apes
…characteristic gorilla group has one silverback (an older dominant male), one or more subordinate blackback males, adult females outnumbering males, and youngsters of various ages. The silverback is the hub of the cohesive group. Chimpanzee society is also dominated by males, which form a stable core of the group. Chimpanzees…
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