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Investigations into the intelligence of gorillas show that gorillas are much smarter than People once thought gorillas were. Gorillas will stack boxes to help gorillas reach bananas that are too high to pick. Gorillas will use sticks as tools to pull into gorillas' cages. one scientist, Dr. James White, trained a female gorillas named cango to perform various actions. when the scientist returned some years later, Cango remembered the scientist. Cango also repeated some of the actions the scientist had taught cango, Cango's behavior in these instances helped convince scientists of gorillas' inteligence.​