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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.)
1 The largest species in terms of weight is the hippopotamus (Hippopotamus amphibius), native to the rivers of sub-Saharan Africa. 2  They can attain a size of 4,500 kg (9,900 lb), 4.8 m (16 ft) long and 1.66 m (5.4 ft) tall. The largest bear, and possibly the largest known mammalian land carnivore of all time, was Arctotherium angustidens. 2  The largest specimen yet found is estimated to weigh up to 1,600 kg (3,500 lb) and stood up to 3.4 m (11 ft 2 in) tall on the hind-limbs.