Imagine a tea party where the guest of honor isn’t a child but a bonobo named Kanzi, sipping on invisible juice. Sounds like a whimsical fantasy, right? But here’s where it gets mind-blowing: scientists have just proven that Kanzi, a bonobo, can indeed imagine and pretend—a skill long thought to be exclusively human. This groundbreaking study, published in Science (https://www.science.org/doi/10.1126/science.adz0743), challenges everything we thought we knew about animal cognition. And this is the part most people miss: it’s not just about a bonobo playing make-believe; it’s about rewriting the boundaries of what we believe animals are capable of.
In a series of cleverly designed experiments, researchers invited Kanzi to participate in a game that mirrored a child’s tea party. They offered him invisible juice and grapes, turning the exercise into a playful test of imagination. The results? Kanzi didn’t just play along—he tracked the imaginary juice as it was poured between a pitcher and bottles, demonstrating a remarkable ability to engage with a pretend scenario while understanding it wasn’t real. As Chris Krupenye, the study’s lead author and an assistant professor at Johns Hopkins University, explains, ‘He’s able to follow along and track the location of a pretend object, but at the same time, he appreciates that it’s not actually there.’
But here’s where it gets controversial: for decades, scientists assumed that pretending and imagining alternate realities were uniquely human traits. Yet, recent observations—like young chimpanzees playing with a ‘log doll’ or moving imaginary blocks (https://link.springer.com/article/10.1007/s10329-020-00836-z)—have begun to chip away at that belief. This new study takes it a step further by providing the first controlled evidence of an animal actively pretending. ‘We think of our ability to imagine other worlds or futures as a hallmark of human mental life,’ Krupenye notes. But these findings suggest that apes ‘might share some of the foundational cognitive machinery that enables imagination.’
To test Kanzi’s abilities, researchers modeled their experiments after childhood development tests. Think about how toddlers engage in pretend play—imaginary friends, tea parties with stuffed animals—and you’ll see the parallels. In the first experiment, researchers used transparent, empty containers to ‘pour’ imaginary juice, then asked Kanzi to indicate where the juice was. Out of 50 trials, Kanzi correctly pointed to the ‘filled’ cup 34 times—a 68% success rate, which is typical for ape cognitive testing. In another test, Kanzi was offered a choice between real and pretend juice, and he consistently chose the real juice, proving he could distinguish between the two.
And this is the part that’ll make you rethink everything: Kanzi wasn’t just mimicking behavior; he was imagining and tracking hypothetical scenarios. As Jan Engelmann, a psychology professor at UC Berkeley, points out, this suggests apes can engage in ‘secondary representations’—modeling multiple scenarios in their minds, including hypothetical ones. This ability isn’t just fascinating; it’s evolutionarily advantageous. ‘You can test things out in your imagination before acting in real life,’ explains Kristin Andrews, a philosophy professor studying animal minds. ‘It’s a game-changer.’
Kanzi, who passed away last year at 44, was no ordinary bonobo. Born in captivity, he was the first bonobo to understand elements of spoken English, thanks to his exposure to lexigrams—symbols representing words (https://www.apeinitiative.org/lexigrams). His language skills were so advanced that researchers shifted their focus from his mother to him, recognizing his unique abilities. By the end of his life, Kanzi could identify hundreds of lexigrams and respond to English prompts.
But here’s the bigger question: if bonobos can imagine and pretend, does this mean our ancestors shared this ability 6-9 million years ago, when humans and bonobos diverged? Or is Kanzi’s skill set unique, perhaps enhanced by his language training? Some scientists argue that language might have given Kanzi an edge, while others believe all apes could possess this ability. What do you think? Is imagination a universal trait, or is Kanzi an outlier?
As we continue to study animals, one thing becomes clear: the line between human and animal cognition is blurrier than we ever imagined. Some researchers even suggest that individual human cognition might not be as superior to that of chimpanzees as we once thought. Instead, our true edge might lie in our social skills and collaboration. ‘What humans excel at is social rationality and thinking together,’ Engelmann says. ‘Language is just one tool that enables this.’
So, the next time you see a child playing pretend, remember Kanzi and his invisible tea party. It’s not just child’s play—it’s a window into the shared cognitive tapestry of life on Earth. What do you think? Are we giving animals enough credit for their mental abilities, or is there still a fundamental gap between human and animal imagination? Let’s discuss in the comments!
