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Bonnie (orangutan)
Bonnie (born about 1978) is a female orangutan living at the National Zoo in Washington D.C.
She began spontaneously whistling, mimicking an animal caretaker making the sound. The importance is that whistling is a sound that is in a human’s—but not an orangutan’s—repertoire. While some "lower primates" have been shown to make non-standard sounds for their species, it has always been the result of intense training, whereas Bonnie just picked up the new sound mechanism. Another interesting aspect is that she seems to whistle just because she likes the sound as opposed to producing this behavior in response to a potential food reward. Bonnie's whistling was documented in ''Primates'' by Dr. Serge Wich et al.
==See also==
*List of apes
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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