Rocky, an orangutan at the Indianapolis Zoo, can copy the pitch and tone of vowel-like sounds made by people, according to a new study.
The ability, demonstrated by Rocky in a video and documented in the journal Scientific Reports, suggests that critical skills underlying human speech were present in the common ancestor of our species and other great apes.
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As the video shows, Rocky -- when rewarded with plenty of peanuts -- can play a successful game of "do-as-I-do." He really nails one of the sounds towards the end of the clip: