Bumblebees Show Problem-Solving Skills Once Thought Limited to Larger-Brained Animals

New Research Suggests Tiny Insect Brains Can Handle Complex Challenges

Bumblebees may have brains no larger than a sesame seed, but new research suggests they are capable of surprisingly advanced problem-solving skills. Scientists in Finland have found that bumblebees can solve tasks similar to those previously associated with highly intelligent animals such as chimpanzees and elephants.

The findings, published recently in the journal Science, add to growing evidence that sophisticated thinking abilities are not limited to animals with large brains.

Inspired by a Famous Chimpanzee Experiment

More than 100 years ago, German psychologist Wolfgang Köhler conducted a landmark experiment involving chimpanzees. In the study, a banana was suspended just out of reach while boxes and crates were left nearby. One chimpanzee famously stacked the boxes to climb up and retrieve the fruit, demonstrating what researchers interpreted as spontaneous problem-solving.

Since then, similar experiments have been carried out with birds and elephants, both of which also managed to solve the challenge.

Now, researchers say bumblebees can join that list.

Olli Loukola, a behavioral ecologist at the University of Turku in Finland, wanted to test whether insects with extremely small brains could demonstrate similar cognitive flexibility.

“I wasn’t expecting that high success rate,” Loukola said after observing the bees’ performance.

Bees Learned to Use a Ball as a Stepstool

To adapt the classic experiment for insects capable of flying, researchers designed a special testing arena. The setup involved a shallow, puck-shaped enclosure that prevented the bees from simply flying directly to the reward.

First, the bees were trained to associate a blue circle with sugar water. According to Loukola, bumblebees learn associations very quickly and soon began actively searching for blue objects.

Researchers then placed the blue target on the ceiling of the enclosure without any sugar water attached. A small Styrofoam ball was positioned nearby.

The bees quickly began interacting with the ball, rolling it around the arena. Eventually, nearly 75% of the bees moved the ball beneath the blue circle, climbed on top of it, and successfully reached the reward area overhead.

The behavior surprised researchers because the insects appeared to understand how the object could help them achieve a goal.

Scientists Tested Whether the Behavior Was Intentional

Researchers considered whether the bees were simply moving the balls randomly rather than intentionally solving the problem.

To test that possibility, the team redesigned the experiment by adding barriers that blocked the bees’ direct view of the blue target. The ball was also placed in a separate part of the enclosure.

Even under those more difficult conditions, about 80% of the bees successfully maneuvered the ball beneath the target before climbing on it.

The results strengthened the researchers’ conclusion that the insects were intentionally solving the task rather than succeeding by chance.

“It’s a first for an insect with a brain the size of a sesame seed,” Loukola said.

Study Highlights the Diversity of Animal Intelligence

The research has attracted attention from scientists studying animal cognition across species.

Cat Hobaiter, a primatologist at the University of St. Andrews who was not involved in the study, said the findings challenge long-held assumptions about intelligence and brain size.

“We had this underlying assumption that somehow bigger brains mean more powerful computations,” Hobaiter said. “And so demonstrating this in the bumblebees is really wonderful.”

She noted that the study mirrors similar experiments conducted on mammals and birds, helping researchers compare cognitive abilities across very different animals.

“Intelligent brains come in really diverse shapes and sizes,” she added.

Why Cognitive Flexibility Matters in Nature

Researchers say this kind of flexible thinking could help bumblebees survive in rapidly changing environments.

In the wild, pollinators constantly face shifting conditions as flowers bloom and disappear throughout the season. The ability to adapt and find new food sources may improve a colony’s chances of survival.

“Today they might find flowers from here, but tomorrow those flowers are not blooming anymore,” Loukola explained. “If the workers can flexibly find new ways to get food for the colony, that’s the skill that they need to have.”

The findings also arrive as scientists in the United States and around the world continue monitoring declining bee populations linked to habitat loss, pesticides, and climate pressures. Understanding bee behavior and intelligence may eventually help conservation efforts aimed at protecting pollinators that play a major role in agriculture and food production.

Researchers Believe More Discoveries Are Ahead

Loukola says the new study is only the beginning. Future research could examine whether bumblebees display physical signals before moments of insight, including subtle body movements or grooming behaviors.

Scientists may eventually even be able to observe brain activity in bees while they solve problems in real time.

For now, Loukola believes researchers are only starting to understand the true cognitive abilities of insects.

“When I started, the limit was somewhere here,” he said, gesturing low with his hand. “And now it’s much higher.”

He added that scientists may need more creative experiments to fully uncover the limits of bumblebee intelligence — assuming those limits are anywhere close to being reached.

William Faulkner

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