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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.)
There are four subspecies of gorillas: the eastern lowland or Grauerâs gorilla (Gorilla beringei graueri); the mountain gorilla (Gorilla beringei beringei); the western lowland gorilla (Gorilla gorilla gorilla); and the Cross River gorilla (Gorilla gorilla diehl).ike all great apes, gorillas have arms that are longer than their legs and tend to walk on all four limbs at certain times â a movement that is called knuckle walking. Adult males are known as 'silverbacks' due to the distinctive silver-colored hair on their backs.