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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.)
Silverback Gorillas are around six feet tall - about the height of an adult male - while females are around five feet tall. Silverback gorillas weigh approximately 350 pounds- about twice the weight of normal adult man. Gorillas are herbivores, and eat only plants. Silverback gorillas were not even known to exist until 1902.Today, their habitat is being destroyed when people use the land for farming and the trees for fuel.