When two established, queenright colonies need to become one — for example combining a failing hive with a strong one before winter — beekeepers rarely just tip one box on top of the other. Sudden contact between two colonies with different nest scents almost always triggers fighting, and one queen is usually killed in the chaos. The newspaper method avoids this by placing a single sheet of ordinary newspaper between the two boxes, with a few knife slits cut in it. Bees below chew through the paper from below while bees above chew from the top, and by the time a gap opens both colonies have absorbed enough of each other's odour through the paper that they treat one another as nestmates rather than intruders.
Many beekeepers place the weaker or newly queenless unit on top of the stronger, queenright colony below — bees generally drift downward more readily than upward, which helps the combined colony consolidate around the queen you intend to keep.
Two stacked hive boxes are separated by a single slitted sheet of newspaper. Scrub through the days after combining, choose how many slits were cut, and set how alike the two colonies smell to see whether the newspaper method produces a calm merge or a dangerous scuffle.
Newspaper chews through faster with more starting slits, and bees from each box gradually migrate through the growing gaps as scent equalises. Fighting risk peaks partway through the process — once contact begins but before the two colonies fully share a scent — and is far higher when the colonies are less compatible to begin with.
Drag "Days since combining" to watch the paper get chewed away and bees start crossing between boxes, or press "Play timelapse" to animate it automatically. Adjust the slit count and colony compatibility to see how each changes the merge speed and the risk banner underneath.
Beekeepers deliberately choose ordinary newsprint rather than thicker paper because it needs to be flimsy enough for worker bees to chew through in a day or two — thick card or plastic sheeting can stall the merge long enough for the colonies to become impatient and break through all at once.