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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.)
Physical Characteristics. Gorillas are the largest of the great apes. With an extremely stocky body, gorillas can weigh up to 400 pounds. Silverbacks, the mature male of each gorilla group, have silver hair on their backs, and can stand up to six feet tall with an arm span of eight feet.espite their great size, gorillas are generally shy and peaceful, and live in groups, called troops, of five to 30 animals, with an average group size of about 11. Active during the day, gorillas spend most of their time looking for food.