Actually, for genuine realism, he shouldn't have been able to learn to speak, or function normally at all in society. There are few cases of feral children, and some of the information about many of them is unreliable. But there are just enough to give us some idea that there is critical mental and social development that must take place in the first couple of years of life, and if it doesn't, the kid simply will never develop fully. Once such case is a feral child from South Africa, who was named Saturday Mthiyane, for the day he was found, and the orphanage to which he was taken. He was about five when found, and lived to age 17 (when he died in a fire). He was raised by monkeys, and never learned to speak, still walked and jumped and whooped like a monkey. He never learned to socialize with other children, would always steal from them, and refused to eat cooked food.
Or another case was Dina Sanichar, in India, in the late 19th century. He was about six when found, lived 28 years with people, and apparently also never learned to speak, and remained seriously impaired for the rest of his life. Oddly enough, he did learn to smoke, and became a heavy smoker.
There are other cases of older children -- say aged five or greater -- who spent years being cared for in the wild by animals, and they seemed to be able to reintegrate into human society and learn to speak and socialize and all the rest. But there really does seem to be a critical period in the first two or three years of life, where if the child doesn't learn human speech and human behavior from his/her parents and other people, the child simply never will. The brain just doesn't develop the right way, and after that it's too late. The damage is done.
Given the fiction Tarzan lost his parents within days of his birth, and was raised entirely by apes, he simply could never have undergone that critical early development.
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