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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.)
The eastern lowland gorilla (Gorilla beringei graueri) also known as the Grauer's gorilla is a subspecies of eastern gorilla endemic to the mountainous forests of eastern Democratic Republic of the Congo.he eastern lowland gorilla has the widest altitudinal range of any of the gorilla subspecies as they can be found in mountainous, transitional and lowland tropical forests.