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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. Even a small, female Gorilla is able to easily rip the arms clean off a man.. I find it funny how people doubt the sheer might of the gorilla and other Apes.