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Gorillas
Call it human bias, but all of the great apes are going on this list. Gorillas, along with chimpanzees, bonobos and orangutans, can be trained to communicate using some sign language. A famous gorilla named Koko took it one step further and reportedly mastered sign language. Koko is said to have known more than 1,000 hand signs and understood 2,000 words of spoken English. In the wild, gorillas use tools, have busy social lives and even laugh.
