The recorded massive silverback Eastern gorilla was weighed 267 kg (589 pounds) shot in Cameron.Silverbacks of Eastern gorilla ( Gorilla beringei ) species have average body weight up to 163 kg, however, in captivity, their body weight reaches about 205 kg (452 pounds).A silverback gorilla is a sexually mature adult gorilla that have silver hair on his back.This body weight is about half of the newborn humans, which weigh up to 7 pounds.Newborn gorillas have body weight from 3 to 5 pounds.Male adult Cross River gorillas (Gorilla gorilla diehli) have an average weight from 140 to 200 kg (310 to 440 pounds), while adult females have upto 100 kg (220 pounds).Male gorillas of the Western lowland gorilla (Gorilla gorilla gorilla) subspecies have average weight up to 140 kg (310 pounds) while females have up to 90 kg (200 pounds).The average weight of an adult male Mountain gorilla (Gorilla beringei beringei) is up to 195 kg (430 pounds), while for an adult female Mountain gorilla, this value is up to 100 kg (220 pounds).
While a full grown female gorilla weighs from 86 to 113 kg (150 to 250 pounds).A full grown male gorilla weighs from 136 to 195 kg (300 to 430 pounds).While in 1997, Smith and Jungers calculated the average weight of 19 adult male gorillas in the wild as 169 kg.In 1970, Grove calculated the average weight of 47 adult male gorillas in the wild as 143 kg.The weight of an adult male gorilla ranges from 300 to 430 pounds, while that of a female gorilla from 150 to 250 pounds.