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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.)
Gorillas are the largest of the great apes. There are two types of species of gorilla eastern gorilla and western gorilla. They are gentle creatures living in family groups led by a big male, the silverback. When they are old enough to breed, young females leave and join another group.