When a colony swarms, hundreds of scout bees fan out to inspect candidate cavities and report back with a waggle dance whose vigour reflects how good the site is. Thomas Seeley's field experiments with artificial nest boxes on Appledore Island showed that scouts consistently prefer certain measurable features over others — and a well-tuned bait hive exploits exactly those preferences.
40 litres (about 10 US gallons) are most attractive; much smaller or much larger boxes score worse.12–15 cm² beats a large gaping hole, which reads as harder to guard.The four scores are combined into an overall attractiveness percentage, weighted by how strongly each factor drove scout choice in the original research (volume matters most, followed by height, entrance and shade). The number of scout bees circling the entrance — and how tightly they orbit — scales with that score.
Seeley found scouts could evaluate a candidate cavity in minutes, checking volume by walking its interior perimeter — and that a swarm can choose a final site through a democratic "quorum sensing" process even when scouts start out disagreeing.
A 3D bait hive mounted on a tree, where changing box volume, height, entrance size and canopy shade drives a live scout-bee attractiveness score and visibly changes how many scouts circle the entrance.
Each site factor is scored against the value scout bees are known to prefer — around 40 litres of volume, meaningful height off the ground, a small defensible entrance and moderate shade — and combined into an overall attractiveness percentage.
Adjust volume, height, entrance size and shade and watch the box resize, the entrance change, and scout bees swarm tighter and in greater numbers as the site becomes more attractive. Rotate and zoom to inspect the trap.
Thomas Seeley's Appledore Island experiments found scouts overwhelmingly preferred roughly 40-litre cavities — close to the internal volume of a standard deep hive box — over both smaller and much larger ones.