How Do Honey Bees Communicate?
Honey bees (Apis mellifera) are social insects that live in colonies of up to 60,000 individuals, and their survival depends on sophisticated communication. From directing nestmates to rich flower patches to coordinating hive defence and regulating colony activities, honey bees employ an extraordinary range of communication methods. Their language involves dance, chemical signals, vibrations, and even electrical fields.
Karl von Frisch and the Waggle Dance
The Austrian ethologist Karl von Frisch (1886–1982) spent decades studying honey bee communication and was the first to decode the waggle dance. His groundbreaking work earned him the Nobel Prize in Physiology or Medicine in 1973, shared with Konrad Lorenz and Nikolaas Tinbergen. Von Frisch's discovery remains one of the most remarkable findings in animal behaviour research.
The Waggle Dance
The waggle dance is the most famous form of honey bee communication and one of the most sophisticated examples of symbolic language in the animal kingdom. A forager bee that has discovered a profitable food source returns to the hive and performs a figure-of-eight dance on the vertical surface of the comb.
How the Dance Encodes Information
1. Direction – The angle of the straight “waggle run” relative to vertical on the comb corresponds to the angle between the food source and the sun. If the bee waggles straight up, the food is in the direction of the sun. If it waggles 60° to the right of vertical, the food is 60° to the right of the sun.
2. Distance – The duration of the waggle run indicates how far away the food is. Longer waggle runs mean greater distances. Roughly, one second of waggling corresponds to about one kilometre of distance.
3. Quality – The vigour and enthusiasm of the dance indicate the quality of the food source. A rich nectar source elicits a more energetic performance with more dance repetitions.
Did you know? Honey bee dances are so precise that nestmates can locate a flower patch several kilometres away with remarkable accuracy, even though they have never visited it before. The system functions as a kind of “satellite navigation” using the sun as a compass reference.
The Round Dance
When food sources are close to the hive (generally within 50–100 metres), foragers perform a simpler round dance instead. This dance involves running in tight circles, alternating direction. It communicates that food is nearby and provides scent information but does not encode precise direction or distance.
Pheromone Communication
Honey bees produce a wide array of pheromones—chemical signals that trigger specific responses in other colony members. These chemical messages are crucial to colony cohesion and function.
| Pheromone | Produced By | Function |
|---|---|---|
| Queen mandibular pheromone (QMP) | Queen | Suppresses worker reproduction; maintains colony unity; attracts drones during mating flights |
| Alarm pheromone | Workers (sting gland) | Alerts nestmates to threats; marks targets for attack; contains isopentyl acetate |
| Nasonov pheromone | Workers (Nasonov gland) | Orientation signal; guides bees to the hive entrance or to a new nest site |
| Brood pheromone | Larvae | Stimulates worker bees to feed and care for the brood; regulates colony growth |
| Footprint pheromone | Workers (tarsal glands) | Marks visited flowers to prevent unnecessary revisits; marks hive entrance |
Vibrational Communication
Honey bees also communicate through substrate-borne vibrations transmitted through the comb. Several distinct vibrational signals have been identified:
- Stop signal – A brief vibration delivered by head-butting a dancing bee, which inhibits waggle dancing. This is used when a food source has become dangerous or unprofitable.
- Piping – Virgin queens produce “tooting” and “quacking” sounds that can be heard by the human ear. Tooting signals a newly emerged queen; quacking comes from queens still inside their cells.
- Worker piping – Short vibrational pulses produced by workers that appear to stimulate foraging activity and preparation for swarming.
Tactile and Trophallactic Communication
Within the dark interior of the hive, direct contact plays a vital role. Bees use their antennae to touch and assess nestmates, exchanging information about identity and colony membership. Trophallaxis—the mouth-to-mouth sharing of food—serves not only as nutrition distribution but also as a means of sharing chemical information about the colony's status, the queen's presence, and the availability of food resources.
Electric Field Communication
Recent research has revealed that honey bees accumulate a positive electrical charge during flight. When a charged bee performs a waggle dance, the electric field it generates may help nearby bees detect and interpret the dance movements, even in the darkness of the hive. This electrostatic communication channel is a relatively new discovery and is still being actively studied.
Communication During Swarming
When a colony swarms, scout bees search for potential new nest sites and return to the swarm cluster to perform waggle dances advertising their findings. A process of democratic decision-making ensues: scouts visit sites advertised by other dancers, and gradually a consensus builds as more bees dance for the best location. This collective decision-making process has been likened to neuronal activity in the brain and typically results in the selection of the optimal available site.
Key Takeaway
Honey bee communication is a multi-modal system involving dance, pheromones, vibrations, touch, food sharing, and possibly electrical fields. The waggle dance, decoded by Karl von Frisch, remains one of the most remarkable examples of symbolic communication in the animal kingdom. Together, these communication channels allow a colony of tens of thousands of individuals to function as a coordinated superorganism.