A honey bee colony runs on a strict energy budget. Nectar and honey brought back by foragers is the colony's only income; everything else — keeping the brood nest near 35°C, feeding larvae, and powering foraging flights — is an expense paid out of that same honey store. When costs exceed income for long enough, the reserve drains and the colony starves; when income exceeds costs, the reserve builds toward winter.
A broodless winter cluster can hold its core near 20-35°C even when it is well below freezing outside, entirely by shivering flight muscles — the same reason a cold snap during spring brood-rearing can bankrupt a colony's stores far faster than the calendar would suggest.
A honey bee colony's income is nectar and honey brought home by foragers; its expenses are thermoregulation, brood-rearing and flight. This simulation lets you tip that balance and watch the honey reserve rise or fall.
Thermoregulation cost rises steeply as outside temperature drops below the brood-nest optimum, while brood-rearing and flight costs scale with colony activity. Net balance between income and total cost fills or drains the honey tank over time.
Adjust outside temperature, forager population and brood nest size, or jump straight to a season preset. Watch the cluster tighten and vibrate faster in the cold, and the amber reserve respond to the live budget readout.
A winter cluster with no brood to warm can survive a cold snap that would bankrupt a spring colony feeding a large brood nest at the same outside temperature — brood-rearing is one of the costliest lines in the budget.