<p><br> Male silverback mountain gorillas gain their distinctive silver tinge at about 13 years old, when they reach adulthood.</p>

Silverback Mountain Gorilla


Male silverback mountain gorillas gain their distinctive silver tinge at about 13 years old, when they reach adulthood.

Photograph by Michael Nichols

Gorillas

See gorilla pictures in this photo gallery from National Geographic.

Published November 16, 2009

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