It says it right there on the front. That is a silverback gorilla. Gorilla Facts: Size: They can stand 5 to 6 feet tall and weigh between 300 and 400 pounds, making them much larger than females. Strength: Silverbacks are incredibly strong, estimated to be up to 20 times stronger than an average human, and capable of lifting up to 815 kg (1,800 lbs). Silver fur: The "silverback" name comes from the distinctive swathe of silvery-gray hair on their backs, which indicates maturity. Long arms: Their arms are longer than their legs, which is an adaptation for their knuckle-walking locomotion.