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There are 2 species - the Western and Eastern gorillas, and both species have silverback males. The larger of the two is the Eastern Gorilla. The maximum size of a male gorilla can be over 225 kg (500 lb) and 1.83 m (6 ft) in the wild, with much heavier weights recorded in captivity. (Although I can't find a decent reference to the recorded sizes either.)
Colo, the oldest gorilla born in captivity, is seen on her 56th birthday at Columbus Zoo in Columbus, Ohio, U.S. in 2006. CLEVELAND (Reuters) - The first gorilla born in captivity, who went on to become the oldest known member of her species, has died at the age of 60, officials at the Columbus, Ohio, zoo that served as her home said on Tuesday.