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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.)
1 There're two species of gorilla: Western Gorilla and Eastern Gorilla. 2  The largest subspecies of gorilla is the Grauer's gorilla (eastern lowland gorilla). 3  A group of gorillas is called a troop. 4  A silverback gorilla is so-called because of the greyish/silver patch he gains on his back when he attains maturity.