Chimpanzee Viki, reared by Keith and Cathy Hayes (1951), was, in retrospect, doomed from the beginning to fail in her attempts to acquire a particular type of language, at least in part because she lacked a gene called FOXP2 and, thus, she couldn't

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Chimpanzees, including Viki, lack the FOXP2 gene in the form that is associated with the fine motor control necessary for producing spoken language, which is why Viki was unable to talk.

Chimpanzee Viki, Reared by Keith and Cathy Hayes (1951), Was