In late summer 2025, a strange bee story made national and international news: thousands of “robber bees” invaded a honey shop in Terrace, British Columbia, looking for food.

The shop belonged to Christine McDonald of Rushing River Apiaries. According to reporting in The Guardian, McDonald entered her shop to find it filled with bees after a hot, dry summer created a nectar gap — a period when natural nectar sources become scarce. The bees had found a small gap in the building and moved in toward stored honey. McDonald covered the honey, diverted the bees toward a lit bathroom, and later sealed the entry point. It reportedly took several days before the bees stopped trying to return.

The story sounds unusual because it happened indoors, but the behaviour behind it is familiar to experienced beekeepers. Robbing is not random. It is a predictable response to scarcity.

What are robber bees?

“Robber bees” are honey bees that enter another colony, exposed equipment, honey room, feed area, or storage space to steal honey or syrup.

They are not a separate kind of bee. They are ordinary worker bees responding to an opportunity. When nectar becomes scarce, foragers search more aggressively for carbohydrate sources. If they find an exposed hive, weak colony, spilled syrup, wet supers, open honey containers, extracted frames, or an unsealed honey room, they recruit more bees to the source.

Once robbing starts, it can escalate quickly.

The smell of honey spreads. More bees arrive. The activity becomes louder and more frantic. Guard bees fight. Dead bees may appear at entrances. Wax cappings can be torn open. Weak colonies can be overwhelmed. Wasps and hornets may also be drawn in. The Guardian report noted that experts warn robbing can lead to invaders killing bees, sometimes killing the queen, tearing open wax cells, and attracting other aggressive insects such as wasps, yellow jackets, and hornets.

For beekeepers, the important point is this: robbing is easier to prevent than stop.

Why nectar dearth triggers robbing

A nectar dearth is a gap between meaningful nectar flows. In many regions, this happens in late summer after major blooms have faded and before fall flowers fully come on. Dearth can also be made worse by drought, heat, mowing, poor forage, or a short local bloom.

During a good nectar flow, bees are busy collecting from flowers. During a dearth, the field force is still strong, but the landscape may not provide enough nectar. Large colonies need carbohydrates to maintain themselves and store for winter. That creates pressure.

When colonies are hungry and strong, and natural nectar is scarce, exposed honey becomes extremely attractive.

This is why robbing often shows up around:

honey harvest;

wet supers left outside;

spilled syrup;

open feeders;

weak colonies;

nucs with large entrances;

dead-outs not cleaned up;

extracted frames left accessible;

honey houses with gaps, screens, cracks, or open doors.

In the B.C. honey-shop incident, the bees reportedly entered through a small gap in a door frame after hot, dry conditions contributed to food scarcity. That detail matters because it shows how little access bees need when the scent of honey is available.

Why weak colonies are most at risk

Robbing is not just a nuisance. It can finish off a weak hive.

A strong colony has more guard bees and more population to defend the entrance. A weak colony may not. Late-season nucs, queenless colonies, colonies with poor brood patterns, colonies weakened by mites, or hives with large entrances can be invaded quickly.

The colony being robbed may already be in trouble. Robbing then makes the problem worse by removing food stores, killing bees, spreading alarm pheromone, increasing stress, and possibly spreading mites or disease through bee-to-bee contact and drift.

For Ontario beekeepers, this matters because robbing season often overlaps with the exact period when colonies are supposed to be preparing for winter. A colony that loses stores in August or September may enter winter light. A colony that gets attacked while already weak may not recover.

What robbing looks like in the bee yard

Robbing can be confused with normal flight, orientation flights, or busy nectar traffic. The difference is behaviour.

Typical signs include:

frantic, chaotic flight at the entrance;

bees trying to enter through cracks or under lids;

fighting at the entrance;

dead bees on the landing board or ground;

wax debris at the entrance;

bees searching around seams, covers, or feed holes;

sudden increase in activity at a weak colony;

bees leaving heavily, often with honey;

ragged or torn cappings inside the hive;

wasps joining the activity.

Orientation flights usually look more organized. Young bees hover in front of the hive facing it, learning location. Robbing looks more aggressive and investigative. Bees are not just flying; they are testing every opening.

How beekeepers accidentally start robbing

Most robbing problems begin with an opportunity.

A beekeeper opens too many hives for too long during a dearth. Honey frames are left exposed. Syrup spills on equipment. Wet supers are put outside. Feeders leak. A weak nuc is given a full-width entrance. A dead-out sits open. Extracted frames are stored in a place bees can access.

The bees do not need an invitation. They only need scent and access.

This is why late-season beekeeping has to be cleaner and faster than spring beekeeping. In spring, bees are often focused on buildup. During a dearth, they are looking for calories.

Fall management: how to prevent robbing

The best robbing control is prevention.

Reduce entrances on weak colonies, nucs, and small colonies before robbing pressure starts. A small colony should not be asked to defend an entrance sized for a strong double.

Do not leave honey, wax cappings, wet frames, extracted supers, or syrup exposed. If bees can smell it, they can find it.

Avoid open feeding near colonies during robbing season. Open feeding can trigger widespread robbing behaviour and does not let you control which colonies receive feed.

Use internal feeders or well-managed hive-top/feed systems that do not leak.

Clean syrup spills immediately.

Work colonies efficiently during nectar dearth. Do not leave hives open longer than necessary.

Avoid inspecting weak colonies in the middle of intense robbing pressure unless action is necessary.

Close up dead-outs immediately. Dead colonies can become open feeding stations and disease-risk sites.

Store honey supers and extracted equipment in bee-tight spaces.

Check honey rooms, sheds, garages, shops, doors, screens, vents, and window gaps. The B.C. incident shows that bees can exploit a small structural gap if the reward is strong enough.

What to do if robbing starts

Once robbing is underway, do not make the colony more exposed.

Close the hive properly. Reduce the entrance immediately. Cover cracks or alternate access points. If the colony is being overwhelmed, a wet sheet or wet towel over the hive can help confuse robbers and reduce scent movement. The Guardian report also noted expert guidance warning against trying to stop a full robbing frenzy directly and mentioning wet blankets as a method used to ward off invaders.

If a weak hive is under attack, reduce the entrance to a very small opening so the colony has a defendable doorway. In severe cases, moving the colony temporarily may help, but that is not always practical and must be done carefully. Internal feeding may be needed once the attack is controlled.

Do not open the hive wide to “check what is happening” while robbing is active. That can turn a bad situation into a collapse.

For honey rooms or shops, the lesson is building control: cover exposed honey, remove attractants, close doors, block light gaps if they are drawing bees inward, seal entry points, and give bees no reward for returning. McDonald’s response — covering honey, diverting bees with light, and sealing the gap — worked because it removed access and broke the reward cycle.

Why this story matters for Ontario beekeepers

The incident happened in British Columbia, but the lesson applies directly to Ontario.

Ontario beekeepers also deal with late-summer nectar gaps, goldenrod timing, drought stress, robbing pressure, wasps, yellow jackets, weak fall colonies, and honey-harvest exposure. The exact timing changes by region and season, but the management principle is the same: during dearth, bees become opportunistic.

For new beekeepers, robbing is one of the first fall behaviours that can feel shocking. A colony that seemed calm in June can become defensive in August. Bees that ignored a bit of exposed comb in spring may mob it later. A small syrup spill can become a frenzy. A weak nuc can be overwhelmed before the beekeeper understands what is happening.

That does not mean bees are “bad” or unusually aggressive. It means the colony is responding to scarcity and food scent.

The practical takeaway

Robbing is a management issue before it is an emergency.

A beekeeper cannot control the weather or the nectar flow, but they can control access to honey, equipment, syrup, and weak colonies. They can reduce entrances. They can keep honey rooms bee-tight. They can avoid open feeding. They can clean spills. They can inspect efficiently. They can recognize dearth conditions before the yard becomes frantic.

The B.C. honey-shop incident made news because thousands of bees entered a building. But for beekeepers, the real lesson is smaller and more useful:

When nectar is scarce, honey scent becomes a beacon.

If bees can smell it and reach it, they will try to take it.

For Ontario beekeepers, especially in late summer and fall, good robbing prevention is not optional. It protects weak colonies, preserves winter stores, reduces fighting, lowers stress, and helps colonies enter winter with the food they worked all season to collect.

Source: The Guardian — “Canadian apiary store owner foils honey heist by marauding swarm of ‘robber bees,’” September 9, 2025: https://www.theguardian.com/world/2025/sep/09/canada-bees-honey-heist