🌡️ What Keeps a Bee Colony Healthy

About this simulation

A honeybee colony survives by balancing two very different jobs at once: fighting off pathogens and parasites like the Varroa mite, and holding the brood nest at a razor-tight 32–36°C so larvae develop properly. This 3D cutaway shows both systems on the same comb — watch the worker cluster tighten or fan out as temperature drifts, while mites and diseased cells spread across the brood as you raise infestation and disease pressure.

How it works

• Thermoregulation — below about 33°C, bees cluster tightly and shiver their flight muscles to generate heat; above about 36°C, bees spread out at the entrance and fan their wings to drive evaporative cooling.
• Varroa destructor — mites attach to bees and brood cells, feeding on fat body tissue and vectoring viruses such as deformed wing virus; higher infestation darkens more cells and adds visible mites.
• Hygienic behaviour — healthy colonies detect and remove diseased or infested brood; the composite health score falls as disease and mite pressure overwhelm this response.
• The comb's hex-cell colour shifts from healthy amber toward grey (chalkbrood), dark brown (foulbrood) or mite-marked red spots as conditions worsen.

Controls

• Varroa infestation — percentage of mite load carried by the colony (0–100%).
• Brood nest temperature — the cluster's current core temperature (28–40°C); watch clustering vs. fanning behaviour change.
• Colony population — how many workers are present to regulate temperature and groom the brood.
• Brood disease — overlay a specific pathogen's signature on the comb.
• ↺ Reseed comb — randomises cell and bee placement. Drag to rotate, scroll to zoom.

Did you know?

A honeybee cluster can hold its core brood temperature within about half a degree even when the outside air is below freezing — a feat of collective thermoregulation with no central controller, achieved purely through thousands of individual bees responding to their local temperature.