Gorilla
The gorilla is robust and powerful, with an extremely thick, strong
chest and a protruding abdomen. Both skin and hair are black. The face
has large nostrils, small ears, and prominent brow ridges. Adults have
long, muscular arms that are 15–20 percent longer than the stocky legs.
Males are about twice as heavy as females and may attain a height of
about 1.7 metres (5.5 feet) and weight (in the wild) of 135–220 kg
(300–485 pounds). Captive gorillas of both sexes may grow quite fat and
hence become much heavier. A wild adult female typically is about 1.5
metres tall and weighs about 70–90 kg. Gorillas lack hair on the face,
hands, and feet, and the chest of old males is bare. The hair of the
mountain gorilla is longer than that of the other two subspecies. Adult
males have a prominent crest on top of the skull and a “saddle” of gray
or silver hairs on the lower part of the back—hence the term silverback, which is commonly used to refer to mature males. The saddle is much more conspicuous in eastern gorillas, which are jet blac
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