Why Bees Are Better at Math Than We Thought — And Can Even Understand Zero

It’s easy to underestimate a honeybee. It weighs less than a paperclip and carries a brain with fewer than one million neurons. In comparison, the human brain has around 86 billion. By size alone, bees should not be doing anything remotely mathematical.

Yet careful scientific experiments show they can count, compare numbers, and even understand the idea of zero — a concept that took humans centuries to define clearly.

This isn’t poetic exaggeration. It’s laboratory-tested evidence.


How Scientists Taught Bees to Count

Over the past decade, researchers studying honeybees (Apis mellifera) designed experiments to test whether these insects could tell the difference between quantities.

Bees were placed in controlled flight arenas and shown two images at a time — for example, one card with two shapes and another with four. If the bee chose the smaller number, it received a drop of sugar solution. If it chose incorrectly, it tasted a mildly bitter liquid.

With repetition, the bees learned the rule: choose the smaller quantity.

To ensure the insects weren’t memorizing patterns, researchers changed the shapes, spacing, and arrangements. The only constant was the number of items. The bees continued to make the correct choice, showing they were responding to quantity itself.

That ability — basic numerical comparison — had already been documented in some mammals and birds. Seeing it in an insect was unexpected.

The Moment Zero Entered the Picture

The breakthrough came in 2018, when a study published in Science by Scarlett R. Howard and colleagues tested something more abstract: whether bees could understand the concept of zero.

After training bees to choose the smaller of two numbers, researchers introduced a blank card alongside cards showing one or more symbols. The blank card represented zero.

The bees chose the blank card significantly more often than chance would predict.

That result suggests they placed “nothing” below one on a mental number scale.

Zero is not intuitive. In human development, children take years to grasp that zero is not just “nothing fully,” but a numerical value that fits into an ordered system. Historically, civilizations struggled to incorporate the concept of zero into mathematics.

Yet bees, through conditioning, demonstrated that they could treat the absence of symbols as less than any positive number.

Learning Through Rewards

The process was straightforward but precise. Bees learned through association. Correct choices brought sweetness; incorrect ones brought bitterness.

Once the rule “choose less” was firmly established, researchers introduced new number combinations — including zero — without prior exposure to blank cards. The bees applied the same logic.

That ability to transfer a learned rule to a new situation is key. It shows flexibility, not memorization.

Beyond Counting: Simple Arithmetic

The surprises didn’t stop there.

In a later study published in Science Advances, researchers trained bees to perform basic arithmetic. Bees were shown several shapes, then flown into a chamber marked with colored cues. One color signaled “add one.” Another meant “subtract one.”

After viewing the initial number, the bees had to choose the correct final quantity according to the color rule.

The insects successfully added or subtracted one from the original number.

This doesn’t mean bees are solving equations on a chalkboard. But it does show they can follow symbolic rules tied to numerical change.

What This Says About Intelligence

For decades, complex number skills were thought to require large brains like those of primates. Honeybees challenge that assumption.

Their brains are tiny, yet structured in ways that allow efficient processing. Researchers such as Adrian Dyer and Aurore Avarguès-Weber, who have led much of this work, argue that sophisticated numerical abilities do not depend solely on brain size.

Instead, evolution may favor compact neural systems that solve specific problems effectively.

In nature, understanding quantity could help bees judge flower clusters, navigate distances, or make quick foraging decisions.

A Different Way to Measure Minds

The idea that a creature with fewer than a million neurons can understand zero reshapes how we think about cognition.

It suggests that intelligence is not simply a matter of scale. It’s about organization, adaptation, and the ability to learn rules.

The next time a bee hovers nearby, it may look like it’s acting on instinct alone. But research tells a more interesting story.

Inside that tiny head is a brain capable of counting, comparing, and recognizing nothing as something meaningful.

For an insect so small, that’s a very big achievement.