The five orangutans all came up with the solution to the 'peanut' problem in the first trial in which they were presented with the task. With 8-year-old children, only 66 percent of them were able to solve the problem.
JULIANE BRAUER: When I give talks about the outstanding cognitive skills in the animal kingdom, I always mention the orangutans… These intelligent creatures have a surprising skill that was actually found accidentally… When Daniel Hanus planned an experiment to study causal reasoning, the test he designed revealed new insights into tool use: He attached a vertical Plexiglas tube outside of the wall of the testing cage. Inside the tube was a yummy peanut.
The orangutans could reach into the tube through the mesh with their very long fingers, but they could not reach the nut down at the bottom of the tube. To reach their reward, the orangutans came up with a solution that the scientists had not even thought of. The apes sucked up water from the water dispenser in their cage and then spat it into the tube. In doing so, they raised the water level. They kept spitting new water into the tube until the peanut floated right to the top. Finally, the apes could pick out the peanut with their fingers…
It took the five orangutans from Leipzig an average of three charges of water to reach the peanut. They all came up with the solution to the problem in the first trial in which they were presented with the task. In the following trials, they became faster and more skilled. While it had taken them about 10 minutes on the first attempt, in later trials it later took them only 30 seconds. They simply saved themselves the trouble of reaching the peanut with their fingers when the water level was not yet high enough (Hanus et al., 2011). But they also did not spit water indiscriminately into the tube when there was no nut in it at all. In a very recent experiment, it was shown that orangutans can even solve that problem with an opaque tube…
All these observations suggest that the red apes solved the peanut problem with insight. But how do other primates perform in this test? Surprisingly, there were not only differences between species, but also between different populations. While the five orangutans from Leipzig had come up with the solution easily, their conspecifics living in a sanctuary on the island of Borneo failed the test. Maybe the apes tested in Borneo were not motivated enough? Two out of three orangutans from a Spanish zoo were successful. In contrast, chimpanzees at Leipzig Zoo had a lot of trouble with the task, but chimps at a sanctuary in Uganda performed much better.
Thus, the task is obviously not easy to solve… Daniel Hanus actually tested 8-year-old children and found that only 66 percent of them were able to solve the problem. Of course, the children did not have to spit the water inside the tube—they could use water from a watering can. In the case of 4-year-olds, not even one out of 10 children came up with the correct solution… But some great apes do — and the audience of my talks then always agrees that animals are smarter than you think. SOURCE…
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