Researchers at Johns Hopkins University have found strong evidence that apes can use imagination and take part in pretend play. This ability was once believed to belong only to humans. The scientists carried out a series of careful experiments. They showed that an ape, also referred to as a bonobo, could understand and respond to make-believe situations. This practice is similar to how young children play pretend games, such as having a tea party. The study published in Science focused on a bonobo named Kanzi. He lives at the Ape Initiative and is well known for understanding human communication.
Kanzi has also been observed in the past showing signs of pretend behaviour. To test this more clearly, researchers created simple experiments that copied the kind of pretend play seen in children. In one experiment, Kanzi sat across a table from a researcher. On the table were empty cups and an empty pitcher. The researcher acted as if they were pouring juice from the pitcher into the cups. Then they pretended to pour the juice out of one cup. After this, the researcher asked Kanzi where the juice was. Even though there was no real juice, Kanzi usually pointed to the cup that was meant to still contain the pretend juice.
He could do the test even when the cups were moved. To make sure Kanzi was not confused, the researchers ran another test. One cup had real juice. The other cup had pretend juice. When asked which one he wanted, Kanzi almost always chose the real juice. This behaviour showed that he knew the difference between real and pretend. In a third test, the researchers used pretend grapes. They pretended to take a grape from an empty container and put it in one of two jars. Then they pretended to empty one jar and asked Kanzi where the grape was. Most of the time, he pointed to the correct jar. Kanzi did not answer every question correctly. However, his results were steady and better than chance. This suggested he was not guessing. Instead, he seemed to understand pretend objects that were not really there.
The researchers believe these findings are significant. They suggest that humans are not the only ones capable of imagining things beyond the present moment. According to the scientists, this skill may have existed millions of years ago in the common ancestors of humans and apes. In humans, pretend play begins early. By around two years old, children can act out imaginary scenes, like serving tea or feeding a doll.
Even younger babies can show surprise when pretend actions do not make sense. Despite many stories and observations from the wild and captivity, no controlled scientific studies had proven that animals could do something similar until now. For example, young chimpanzees have been seen carrying sticks as if they were babies. In another case, a captive chimp appeared to drag invisible blocks across the floor after playing with real ones. These behaviours were interesting, but scientists wanted clear experimental proof. This new research provides that proof, at least for one ape. One of the researchers said it is exciting to think that apes can imagine unreal things while knowing they are unreal.
This work shows that the mind is complex and flexible. The research team wants to continue this work with other apes and maybe animals. They hope to learn if animals can imagine more than the present moment. This includes thinking about the future or understanding what others may be thinking. The scientists say these findings should change how people see animals. If apes have rich mental lives, they are not simple or mechanical beings. They can think and imagine in meaningful ways. Because of this, they deserve care, respect, and protection.
