Apes Can Imagine: Bonobo Aces Pretend Tea Party Tests

A bonobo named Kanzi just changed what we thought we knew about animal minds by playing pretend with invisible juice and grapes.

Scientists at Johns Hopkins University sat down with the 43-year-old bonobo for a series of imaginary tea parties. They wanted to test whether apes could imagine things that aren't really there, a cognitive skill we've always considered uniquely human.

The experiments were beautifully simple. Researchers placed empty cups and pitchers on a table between them and Kanzi. They pretended to pour juice into one cup, then mimed dumping it out of another. When asked where the juice was, Kanzi pointed to the correct cup most of the time.

To make sure Kanzi wasn't just guessing or assuming there was real juice he couldn't see, the team added a twist. They placed real juice next to the pretend juice and asked what he wanted. Kanzi chose the real juice almost every time, proving he understood the difference between imagination and reality.

The same pattern held with pretend grapes. Kanzi tracked imaginary objects as they moved between containers, showing he could create and maintain a mental picture of something that didn't exist.

"It's extremely striking and very exciting that the data seem to suggest that apes, in their minds, can conceive of things that are not there," says co-author Amalia Bastos from the University of St Andrews. Kanzi wasn't just responding randomly. He was genuinely engaging with pretend objects the way a toddler would during playtime.

Why This Inspires

This discovery does more than expand our understanding of animal cognition. It reminds us that the mental lives of other creatures may be far richer than we've given them credit for.

Co-author Christopher Krupenye compares the finding to Jane Goodall's discovery that chimpanzees make tools, which forced us to redefine what makes humans special. "Imagination has long been seen as a critical element of what it is to be human, but the idea that it may not be exclusive to our species is really transformative," he says.

The ability to imagine likely evolved at least nine million years ago, shared by our common ancestors. Wild chimpanzees have been seen carrying sticks like dolls, cradling them the way mothers hold their babies. Now we have controlled proof that this pretend behavior reflects genuine imagination.

The researchers hope to explore other aspects of ape imagination next, like whether they can think about the future or guess what's going on in another ape's mind. "We should be compelled by these findings to care for these creatures with rich and beautiful minds and ensure they continue to exist," Krupenye adds.

Kanzi's tea party proves that imagination isn't what separates us from other animals but what connects us to them.