Regarding human speech, one scientist made an experiment in which he raised an orangutan as if it were his child. After the age of three, the animal could say "Ma," "Pa," and "cup," and use them in the proper situations, as if it were a one-year- old human baby.
至於動物是否可學人語？曾有一個科學家以撫育嬰兒的方法養猩猩，這個試驗的結果是：猩猩養到三歲後，不但學會了媽媽、爸爸、cup 的發音，還能正確的應用。