
In a paper published in December in Primates, an international journal of primatology that provides a forum on all aspects of primates in relation to humans and other animals, Great Ape Trust scientist Dr. Serge Wich and his colleagues provide the first-ever documentation of a primate mimicking a sound from another species without being specifically trained to do so. Bonnie, a 30-year-old female orangutan living at the Smithsonian National Zoological Park in Washington, D.C., began whistling—a sound that is in a human’s, but not an orangutan’s, repertoire—after hearing an animal caretaker make the sound......The behavior goes against the argument that orangutans have no control over their vocalizations and the sounds are purely emotional—that is, an involuntary response to stimuli such as predator
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