WHY BEES STING

Bee Sting Behaviour Explained

Bee stings are a defensive mechanism, not a random act of aggression. Understanding why bees sting, what happens after a sting, and how humans react helps beekeepers, outdoor workers, and nature enthusiasts stay safe around hives in South Africa.

Why Bees Sting

The primary motivation for stinging is defence. Honeybees sting when they or their colony are threatened. They do not attack unprovoked.

Common triggers include:

• Defending the hive, queen, and stored honey
• Direct physical threats, such as being stepped on or trapped in clothing
• Strong vibrations, dark clothing, or certain odours near the hive entrance

In South Africa, defensive behaviour is often heightened in warm months (spring and summer) when colonies are strongest and honey flows peak.

Stinger Morphology: Honeybees vs Wasps

The structure of the stinger determines how the insect stings and what happens afterward.

Honeybees (Apis mellifera):

• Have barbed stingers.
• These barbs embed in elastic skin, making withdrawal impossible.
• The bee dies shortly after stinging mammals.

Wasps and bumblebees:

• Have smooth, lance-like stingers.
• Can sting multiple times without self-harm.
• Use stings for both defence and predation.

Feature	Honeybee	Wasp / Bumblebee
Stinger Type	Barbed	Smooth
Stinging Result	Single sting; bee dies	Multiple stings possible
Stinger Left Behind	Yes, with venom sac	No, stinger retracted
Primary Behaviour Driver	Colony defence (altruistic)	Defence and predation

What Happens During and After a Honeybee Sting

Effect on the Bee

1. Stinger penetrates the skin.
2. Barbs anchor it firmly.
3. When the bee pulls away, the stinger, venom sac, and associated muscles tear away, leading to abdominal evisceration.
4. The bee dies shortly thereafter.

This sacrificial act protects the colony — a single bee gives its life to deter threats.

Stinger’s Autonomous Function

Even after detachment, the stinger assembly keeps working:

• Muscles contract rhythmically, injecting venom for 45–60 seconds.
• Prompt removal reduces venom delivered.

Use a flat object like a fingernail or credit card to scrape the stinger out. Pinching may squeeze more venom into the wound.

Human and Animal Reactions

Typical local reaction:

• Immediate sharp pain (caused mainly by melittin)
• Redness, swelling, itching, and warmth
• Usually resolves within hours to a day

Severe allergic reaction (anaphylaxis):

• Occurs in around 1–3% of the population
• Symptoms include throat swelling, difficulty breathing, rapid pulse, dizziness, and widespread hives
• Requires immediate emergency treatment, typically with epinephrine

In South Africa, rural clinics and farms should keep epinephrine auto-injectors or adrenaline ampoules accessible during honey harvesting or hive inspections, especially in high-density apiary zones.

For a deeper look at venom composition and its effects, see How Bees Make Venom.

Alarm Pheromones and Hive Defence

When a honeybee stings, it releases alarm pheromones, mainly isopentyl acetate.

These pheromones:

• Mark the threat’s location
• Alert guard bees, potentially triggering a mass defensive response

This is why multiple bees often attack the same target if the initial stinger isn’t removed quickly. Washing the sting site with soap and water or applying smoke can help mask the pheromone scent.

For more on pheromones and bee communication, see Bee Communication: How Colonies Coordinate Behaviour.

Summary and Key Points

• Honeybees sting to defend their colony, not out of aggression.
• Barbed stingers cause the bee’s death after stinging mammals, unlike smooth-stinger insects.
• Quick stinger removal limits venom injection.
• Severe allergic reactions are rare but require immediate care.
• Alarm pheromones can escalate hive defensive responses.

Understanding these dynamics helps beekeepers and the public handle stings calmly and minimise further risk.

We also need to keep in mind that they do not reason like humans, so bees do not sting based on emotions such as revenge or anger.