Last Updated September 15, 2026
A bumblebee learns two separate things in the lab: a blue artificial flower reliably contains a sugar reward, and a small ball nearby can be pushed around without any danger. Neither lesson, on its own, teaches the bee anything about combining the two. Then the researchers change the setup so the reward is out of the bee’s reach — reachable only by pushing the ball into position first. In a study published June 4, 2026, in Science, a striking number of bumblebees worked it out anyway, on the first try, with no trial-and-error and no training on the actual solution.
Key Takeaways
- Bumble bees (Bombus terrestris) spontaneously combined two separately-learned facts — “the flower means reward” and “the ball is safe to move” — to solve a completely new problem they had never been trained to solve.
- About 75% of tested bees successfully rolled the ball into place and climbed it to reach the relocated flower, according to the University of Oulu-led research team.
- Researchers ruled out lucky accidents, play behavior, trial-and-error, and simple visual guidance with stringent control experiments — including hiding the flower from view while the bee moved the ball.
- The behavior echoes psychologist Wolfgang Köhler’s century-old “box-and-banana” experiments with chimpanzees, but this is the first time this specific kind of spontaneous, goal-directed object-tool problem-solving has been demonstrated in an insect.
- The researchers are careful to say this doesn’t mean bees reason like humans — it means a nervous system far smaller than a vertebrate’s can still generate flexible solutions to brand-new problems.
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Ruling Out the Easy Explanations
The obvious skeptical response to a result like this is that the bees must have just gotten lucky, or stumbled onto the answer through blind trial-and-error, or were picking up some simple visual cue the researchers didn’t control for. The study’s authors — a team from the University of Oulu, the University of Helsinki, and the University of Turku, led by Akshaye Bhambore and senior author Olli Loukola — anticipated exactly that objection and built stringent controls to rule out those simpler explanations, and the behavior held up. Bees that had separately learned “flower equals reward” and “ball is safe to move” spontaneously combined the two pieces of information to solve a problem they’d never been trained on and never seen solved before.
In the most demanding version of the test, the flower was hidden from the bee’s view while it moved the ball, which rules out the bee simply steering toward a visible target. Bees still succeeded. According to the University of Oulu’s own summary of the research, roughly 75% of bees that had learned the two separate associations went on to roll the ball to the correct spot and climb it to reach the reward.
“This is essentially an insect version of the classic ‘box-and-banana’ problem. The animal must realize that an object can be repositioned and then used as a tool to reach an otherwise inaccessible goal. What stands out about the result is that this kind of spontaneous problem-solving is now demonstrated in an insect.”
The “box-and-banana” reference is to psychologist Wolfgang Köhler’s landmark early-20th-century experiments, in which chimpanzees were shown stacking crates to reach out-of-reach fruit — a result that became one of the founding demonstrations of animal insight. That this specific kind of spontaneous tool-repositioning had, until now, mostly been studied in large-brained animals like primates and corvids is exactly what makes a bee doing it noteworthy.
The science news outlet Science News put together short video footage of the actual experiment in action, showing a bumblebee rolling the ball into place and climbing it to reach the reward — worth watching directly, since a written description doesn’t quite capture how deliberate the bee’s movements look on camera. The clip below covers the same ball-and-flower setup described above: a bee locating the ball, pushing it under the relocated flower, and climbing on to feed.
What the Controls Ruled Out
| Alternative explanation | How researchers ruled it out |
|---|---|
| Accidental / lucky success | Success rate measured across many bees and trials, not a one-off event (~75% success) |
| Trial-and-error learning | Bees had never been trained on the ball-rolling solution itself, only on the two separate facts |
| Simple visual guidance toward the flower | Flower hidden from view while the bee moved the ball in the hardest control condition; bees still succeeded |
| Undirected play behavior | Successful bees showed more directed, efficient movement patterns, not random ball-pushing |
Small Brain, Real Insight
The headline takeaway isn’t just “bees are smarter than people assumed” — it’s more specific than that. It’s evidence that flexible, insight-like problem-solving isn’t exclusively tied to large-brained vertebrates, which is a genuinely significant claim in cognitive science rather than a cute trivia fact. This site has already covered related ground in its look at bee numerical cognition, which documents honeybees’ surprising capacity for basic counting and quantity discrimination, and in its broader deep dive into honeybee brain and cognition. Read together, this research points the same direction: insect brains, despite their tiny size relative to a mammal’s, appear to be running more sophisticated computation than the simple stimulus-response model long assumed for animals with brains this small.
“We are not claiming that bees think like humans. But our findings show that miniature brains can generate flexible solutions to novel problems in ways we are only beginning to understand.”
None of this changes anything about how a backyard beekeeper manages a colony day to day, and bumblebees aren’t even the species most beekeepers keep. But it does reshape a genuinely open scientific question — how much cognitive complexity a nervous system actually needs to produce flexible problem-solving — in a direction that keeps surprising the researchers asking it. The full peer-reviewed paper, “Spontaneous problem-solving in bumble bees,” is available via PubMed for readers who want the underlying methodology and data rather than the press summary.
Frequently Asked Questions
What species of bee was tested in this study?
Bombus terrestris, the buff-tailed bumblebee, a common European bumblebee species widely used in cognition research because colonies are easy to maintain in lab conditions.
Were the bees trained to solve the ball-and-flower puzzle?
No. They were only trained on two separate, simpler facts beforehand — that the flower meant reward, and that the ball was safe to move. Combining those into a solution for reaching a relocated flower was never demonstrated or trained.
How many bees actually solved the problem?
Roughly 75% of bees that had learned the two prerequisite associations went on to successfully roll the ball into position and climb it to reach the reward, per the University of Oulu’s summary of the results.
Does this mean bees are as intelligent as chimpanzees?
No — the researchers explicitly caution against that interpretation. The finding is that a specific kind of spontaneous, goal-directed problem-solving (long studied mainly in large-brained animals) also shows up in an insect, not that bee cognition matches primate cognition overall.
Does this apply to honeybees too, or just bumblebees?
This specific study tested bumblebees only. Separate research on honeybees has shown other forms of sophisticated cognition, including basic numerical ability, but spontaneous tool-repositioning like this hasn’t been demonstrated in honeybees specifically.
Who led the research and where was it published?
Lead author Akshaye Bhambore and senior author Olli Loukola, with colleagues from the University of Oulu, University of Helsinki, and University of Turku in Finland. It was published in the peer-reviewed journal Science on June 4, 2026.
Related Reading
For a related deep dive, check out our article on what honeybee cognition research has found.
Image credits: Photo: Bob Peterson, CC BY-SA 2.0, via Wikimedia Commons.
