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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.)
WWF works to designate new gorilla sanctuaries, such as in Congo. Adult male gorillas weigh up to 440 pounds and can reach a height of six feet when standing on two legs. Mature male gorillas are known as âsilverbacksâ for the white hair that develops on their back at about 14 years of age.Females have a gestation period of 8.5 months and nurture their young for several years. Generally, females give birth to one baby every four to six years.ature male gorillas are known as âsilverbacksâ for the white hair that develops on their back at about 14 years of age. Females have a gestation period of 8.5 months and nurture their young for several years. Generally, females give birth to one baby every four to six years.