An orangutan was able to mimic human speech as it learned new sounds from an international team of scientists.
They may seem more like grunts, but the orangutan you heard is showing some key vocal skills. Rocky was able to control his tone and pitch to repeat the random vowel sounds made by the researchers.
Before this study, scientists believed great apes lacked the ability to control their voices. That meant they were limited to a few dozen preset sounds and couldn't learn to produce new ones — making it a mystery how human speech could have evolved.
But Rocky's sounds were cross-referenced against 12,000 hours of tapes from over 100 other orangutans, and the data showed they were different. Rocky was able to learn new sounds and control them in a "conversational" context.
That learning aspect is key, too, since all humans learn language after birth.
Speech is one of humanity's most valuable abilities, and this study shows the foundation for it may have already existed the last time humans and orangutans had a common ancestor — more than 11 million years ago.