How honeybees really crown their queens

For generations, scientists believed a queen honeybee was made almost entirely by diet: feed an ordinary larva enough royal jelly and a ruler emerges. But new research suggests queens are created through a more elaborate process.

Young worker bees construct specialized nursery chambers complete with custom wax, warmer temperatures, and devoted attendants that help determine whether a larva becomes royalty.

Published today in the journal Nature, the study found that wax chambers where future queens develop, called queen cells or "royal cribs," are not simply protective shelters, but carefully engineered environments essential to producing healthy queens. Researchers identified a previously unrecognized class of young worker bees dubbed "queen cell builders" that appear uniquely adapted for the task.

"The old idea was relatively simple: take an egg, move it into a queen cell, feed it royal jelly, and you get a queen," said Boris Baer, entomologist and director of the Center for Integrative Bee Research (CIBER) at the University of California, Riverside, whose laboratory contributed to the work. "What we found is that there's an entire machinery behind this process. It's much more sophisticated than we imagined."

Honeybee queens and workers begin life the same way: as nearly identical eggs. Yet queens grow larger, mature faster, and live dramatically longer than worker bees. They are also the colony's sole egg layer, responsible for producing the next generation of bees.

Scientists have long credited royal jelly, a milky, nutrient-rich substance worker bees feed to young larvae, as the primary force behind that transformation.

The new study suggests food is only part of the story.

Using thermal imaging, behavioral tracking, materials science, and chemical testing, the researchers found that queen cells differ sharply from the familiar hexagonal chambers used to rear worker bees.

The peanut-shaped queen cells are built from wax with distinct physical and chemical properties, making them less dense, more pliable, and better able to maintain warmth and moisture for developing larvae. The wax also differed in its fatty acids and chemical signals, creating what researchers describe as a specialized developmental environment.

To test whether the nursery itself mattered, the researchers raised developing queens in cells made either from queen wax or ordinary worker wax. Larvae raised in worker wax were more likely to die and grew into smaller queens, even when fed the same diet, suggesting that the surrounding environment plays a critical role in development.

The study also revealed the workers behind the process. Queen cell builders, typically younger than other hive workers, maintain elevated body temperatures and altered physiology while tending future queens. The extra warmth appears to speed development: queen bees mature in about 16 days, compared with roughly 21 days for worker bees, an advantage when a colony urgently needs a new ruler.

Rather than simply recycling wax, the bees actively gather, modify, and enrich materials for royal chambers. They also activate different biological processes tied to wax production, essentially changing how their bodies function while tending future queens.

Researchers even tracked how the bees repurposed material from elsewhere in the hive. By adding trace amounts of graphite to ordinary honeycomb, the team showed that darkened wax eventually appeared in queen cells, evidence that workers were selectively gathering and transforming material for royal use.

The process, Baer said, resembles something closer to a royal court than a simple insect nursery. It is clear that bees execute a tightly coordinated effort devoted to producing the colony's next ruler.

"You can think of it as something like Buckingham Palace," he said. "There is a dedicated group of bees focused entirely on raising the queen, and if they don't get it right, the colony cannot reproduce."

The researchers found the same pattern in both Asian and European honeybee species, suggesting the strategy may be deeply rooted in honeybee evolution.

This work brought together researchers with expertise ranging from behavior and physiology to materials science, chemistry, and genomics. It was led by two former UCR postdoctoral researchers, Yu Fang and Yahya Al Naggar. "In its collaborative nature, this project reflects the broader CIBER philosophy of bringing different disciplines together to tackle complex biological questions," Baer said.

Beyond honeybees, the findings may change how scientists think about development more broadly, including the ways surroundings, social groups, and built environments shape biology.

For decades, queen bees seemed to offer one of biology's simpler stories: special food makes a special insect. The new findings suggest that a queen emerges not from diet alone, but from an entire society working together to shape her future.

"This work highlights how much sophistication exists inside insect societies," Baer said. "Honeybee colonies are not simply collections of individuals. They function as integrated biological systems capable of engineering their own environments."

(Cover image: Yu Fang/UCR)