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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.)
A group of gorillas can have a territory of up to 16 square miles (41 square kilometers), according to National Geographic. 1  Researchers working in the rainforest of the Central African Republic followed a male silverback gorilla named Makumba (shown here) for 12 months.