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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.)
Approximately 20 times stronger than a sturdy man. A full grown male Silverback gorilla is one of the strongest land mammals on Earth, able to rip car doors clean off and snap tree limbs with ease. an olympian can lift 500lbs per leg ..