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Rocky The Orangutan Has Learnt How To Mimic Human Speech
In Animals by Emily, July 29, 2016

An adolescent orangutan named Rocky has provided researchers with new insight into how human speech first evolved. He is able to emulate human speech by copying his trainers and learning more than 500 new vowel-like sounds, something that scientists thought was impossible for great apes to manage.

Rocky The Orangutan Has Learnt How To Mimic Human Speech

“Rocky, then eight, was studied in 2012 at Indianapolis Zoo in the USA” Photo credit: Mark Kaser/University of Durham

Dr Adriano Lameira, from the University of Durham, explained in a statement: “Our latest findings open up the potential for us to learn more about the vocal capacities of early hominids that lived before the split between the orangutan and human lineages to see how the vocal system evolved towards full-blown speech in humans.”

Rocky cannot speak but shows more control over his voice than previously thought

He was able to copy the pitch and tone of sounds produced by the researchers, making vowel-like calls something that is thought to have been critical for the development of language. When compared to a massive database of over 12,000 hours’ worth of wild orangutan calls, the scientists found no other noises like those produced by Rocky during his imitations, showing that he was able to learn new sounds.


“Instead of learning new sounds, it has been presumed that sounds made by great apes are driven by arousal over which they have no control, but our research proves that orangutans have the potential capacity to control the action of their voices,”explained Dr Adriano Lameira, the co-author of the study published in Scientific Reports.

This ability of what is known as “vocal fold control” is thought to have been critical in the evolution of language in our ancestors, but as it has never been seen before in apes, it was presumed to have developed after our lineage split off from our last common ape ancestor.

The paper interestingly concludes: “A non-human great ape can achieve levels of volitional voice control qualitatively comparable to those manifested in humans.” In fact, the researchers claim that the incredible degree to which Rocky is able to control his voice is a bit similar to how humans conduct a conversation.

Interestingly, another captive orangutan from a previous research was even able to make sounds that had the same rhythm and pitch as human speech.

H/T to iflscience

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