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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.)
Saltwater Crocodile (7 meters long and weighing up to 2,000 kg) is known largest living reptile on earth and accepted by Guinness world records. Nile and Orinoco crocodile are second and third largest crocodiles after saltwater crocodile and the Leatherback sea turtle is the largest turtle and fourth largest reptile.